OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
 
                                       OF
 
                              BRENCO, INCORPORATED
 
                                       AT
 
                             $16.125 NET PER SHARE
 
                                       BY
 
                                   BAS, INC.
 
                          A WHOLLY OWNED SUBSIDIARY OF
 
                               VARLEN CORPORATION
 
  THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
         TIME, ON THURSDAY, JULY 18, 1996 UNLESS THE OFFER IS EXTENDED.
 
    THE  BOARD OF DIRECTORS OF BRENCO, INCORPORATED HAS UNANIMOUSLY APPROVED THE
OFFER, THE MERGER  (AS HEREINAFTER  DEFINED) AND THE  ACQUISITION AGREEMENT  (AS
HEREINAFTER DEFINED), HAS DETERMINED THAT THE TERMS OF THE OFFER, THE MERGER AND
THE  ACQUISITION  AGREEMENT  ARE  FAIR  TO AND  IN  THE  BEST  INTERESTS  OF THE
SHAREHOLDERS OF BRENCO, INCORPORATED AND RECOMMENDS THAT SHAREHOLDERS ACCEPT THE
OFFER AND TENDER THEIR SHARES (AS HEREINAFTER DEFINED) PURSUANT TO THE OFFER.
 
    THE OFFER  IS CONDITIONED  UPON,  AMONG OTHER  THINGS, THERE  BEING  VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR TO THE EXPIRATION DATE (AS HEREINAFTER DEFINED)
A  NUMBER  OF SHARES  OF BRENCO,  INCORPORATED WHICH,  TOGETHER WITH  THE SHARES
BENEFICIALLY OWNED BY VARLEN CORPORATION, BAS, INC. AND/OR OTHER SUBSIDIARIES OF
VARLEN CORPORATION, REPRESENTS AT LEAST TWO-THIRDS OF THE TOTAL NUMBER OF SHARES
THEN OUTSTANDING  ON  A  FULLY  DILUTED  BASIS.  THE  PURCHASER  ESTIMATES  THAT
APPROXIMATELY 6,639,627 SHARES WILL NEED TO BE VALIDLY TENDERED (AND NOT VALIDLY
WITHDRAWN) TO SATISFY THIS MINIMUM CONDITION (AS HEREINAFTER DEFINED). THE OFFER
IS SUBJECT TO CERTAIN OTHER CONDITIONS. SEE SECTIONS 1, 13 AND 16.
 
    VARLEN  CORPORATION  HAS ENTERED  INTO A  SHAREHOLDER TENDER  AGREEMENT WITH
CERTAIN SHAREHOLDERS OF  BRENCO, INCORPORATED INCLUDING  THE CHAIRMAN AND  CHIEF
EXECUTIVE  OFFICER OF  BRENCO, INCORPORATED AND  CERTAIN MEMBERS  OF HIS FAMILY,
PURSUANT TO WHICH, AMONG OTHER THINGS, SUCH SHAREHOLDERS HAVE AGREED (SUBJECT TO
CERTAIN  EXCEPTIONS)  TO  TENDER  IN  THE  OFFER  APPROXIMATELY  20.7%  OF   ALL
OUTSTANDING SHARES.
                             ---------------------
 
                                   IMPORTANT
 
    ANY  SHAREHOLDER DESIRING TO  TENDER ALL OR A  PORTION OF SUCH SHAREHOLDER'S
SHARES SHOULD  EITHER (1)  COMPLETE AND  SIGN THE  LETTER OF  TRANSMITTAL (OR  A
FACSIMILE  THEREOF)  IN  ACCORDANCE  WITH  THE  INSTRUCTIONS  IN  THE  LETTER OF
TRANSMITTAL AND MAIL  OR DELIVER  THE LETTER  OF TRANSMITTAL  TOGETHER WITH  THE
CERTIFICATE(S)  EVIDENCING SUCH SHARES, AND ANY OTHER REQUIRED DOCUMENTS, TO THE
DEPOSITARY OR  TENDER  SUCH SHARES  PURSUANT  TO THE  PROCEDURE  FOR  BOOK-ENTRY
TRANSFER  SET FORTH IN SECTION  4 OR (2) REQUEST  HIS BROKER, DEALER, COMMERCIAL
BANK, TRUST  COMPANY OR  OTHER NOMINEE  TO  EFFECT THE  TRANSACTION FOR  HIM.  A
SHAREHOLDER  WHOSE  SHARES  ARE REGISTERED  IN  THE  NAME OF  A  BROKER, DEALER,
COMMERCIAL BANK,  TRUST  COMPANY OR  OTHER  NOMINEE MUST  CONTACT  SUCH  BROKER,
DEALER,  COMMERCIAL BANK,  TRUST COMPANY  OR OTHER  NOMINEE IF  SUCH SHAREHOLDER
DESIRES TO TENDER SUCH SHARES.
 
    A  SHAREHOLDER  WHO  DESIRES  TO   TENDER  SHARES  AND  WHOSE   CERTIFICATES
REPRESENTING  SUCH SHARES  ARE NOT IMMEDIATELY  AVAILABLE, OR  WHO CANNOT COMPLY
WITH THE PROCEDURES FOR BOOK-ENTRY TRANSFER  ON A TIMELY BASIS, MAY TENDER  SUCH
SHARES  BY FOLLOWING THE PROCEDURE FOR  GUARANTEED DELIVERY SET FORTH IN SECTION
4.
 
    QUESTIONS AND REQUESTS  FOR ASSISTANCE  MAY BE DIRECTED  TO THE  INFORMATION
AGENT  OR  TO THE  DEALER MANAGER  AT THEIR  RESPECTIVE ADDRESSES  AND TELEPHONE
NUMBERS SET FORTH ON THE BACK COVER OF THIS OFFER TO PURCHASE. ADDITIONAL COPIES
OF THIS OFFER TO PURCHASE, THE  LETTER OF TRANSMITTAL, THE NOTICE OF  GUARANTEED
DELIVERY  AND OTHER RELATED MATERIALS MAY  BE DIRECTED TO THE INFORMATION AGENT,
THE DEALER MANAGER, OR TO BROKERS, DEALERS, COMMERCIAL BANKS OR TRUST COMPANIES.
                             ---------------------
 
                      THE DEALER MANAGER FOR THE OFFER IS:
 
                                LEHMAN BROTHERS
 
June 20, 1996

                               TABLE OF CONTENTS
 


SECTION                                                      PAGE
- -------                                                      -----
                                                       
INTRODUCTION...............................................     1
    1.   Terms of the Offer; Expiration Date...............     4
    2.   Acceptance of and Payment for Shares..............     4
    3.   Withdrawal Rights.................................     5
    4.   Procedures for Accepting the Offer and Tendering
          Shares...........................................     6
    5.   Certain Income Tax Consequences...................     8
    6.   Market Prices of Shares; Dividends................     9
    7.   Certain Effects of the Offer......................     9
    8.   Certain Information Concerning the Company........    10
    9.   Certain Information Concerning the Purchaser and
          Varlen...........................................    12
   10.   Background of the Offer...........................    14
   11.   Purpose of the Offer and the Merger; Plans for the    16
          Company; the Acquisition Agreement and
          Shareholder Tender Agreement.....................
   12.   Source and Amount of Funds........................    24
   13.   Certain Conditions of the Offer and the Merger....    25
   14.   Dividends and Distributions.......................    27
   15.   Certain Legal Matters.............................    28
   16.   Extension of Tender Period, Termination and
          Amendments.......................................    31
   17.   Certain Fees and Expenses.........................    32
   18.   Miscellaneous.....................................    33
Schedule A -- Directors and Executive Officers of Varlen
and the Purchaser..........................................   A-1


TO THE HOLDERS OF COMMON STOCK OF BRENCO, INCORPORATED:
 
                                  INTRODUCTION
 
    BAS,  Inc.,  a Virginia  corporation (the  "Purchaser")  and a  wholly owned
subsidiary of  Varlen Corporation,  a  Delaware corporation  ("Varlen"),  hereby
offers  to purchase all outstanding shares of  the Common Stock, par value $1.00
per share (the "Shares"), of  Brenco, Incorporated, a Virginia corporation  (the
"Company"),  at  $16.125 per  Share,  net to  the  seller in  cash,  without any
interest, upon the terms and subject to  the conditions set forth in this  Offer
to  Purchase and in the related Letter of Transmittal (which together constitute
the "Offer"). Tendering shareholders will not be obligated to pay brokerage fees
or commissions  or, except  as  set forth  in Instruction  6  of the  Letter  of
Transmittal,  stock  transfer  taxes  with respect  to  the  purchase  of Shares
pursuant to the Offer. The Purchaser will pay charges and reimbursable  expenses
of Lehman Brothers Inc., which is acting as the Dealer Manager for the Offer (in
such capacity, the "Dealer Manager"), Harris Trust Company of New York, which is
acting  as the Depositary (the "Depositary") and D.F. King & Co., Inc., which is
acting  as  the  Information  Agent  (the  "Information  Agent"),  incurred   in
connection with the Offer.
 
    THE  BOARD OF DIRECTORS  OF THE COMPANY HAS  UNANIMOUSLY APPROVED THE OFFER,
THE MERGER AND THE ACQUISITION AGREEMENT,  HAS DETERMINED THAT THE TERMS OF  THE
OFFER,  THE MERGER  AND THE ACQUISITION  AGREEMENT ARE  FAIR TO AND  IN THE BEST
INTERESTS OF THE SHAREHOLDERS  OF THE COMPANY  AND RECOMMENDS THAT  SHAREHOLDERS
ACCEPT THE OFFER AND TENDER THEIR SHARES PURSUANT TO THE OFFER.
 
    THE  OFFER  IS CONDITIONED  UPON, AMONG  OTHER  THINGS, THERE  BEING VALIDLY
TENDERED AND NOT WITHDRAWN PRIOR  TO THE EXPIRATION DATE  A NUMBER OF SHARES  OF
THE  COMPANY WHICH, TOGETHER  WITH THE SHARES BENEFICIALLY  OWNED BY VARLEN, THE
PURCHASER AND/OR OTHER SUBSIDIARIES OF VARLEN, REPRESENTS AT LEAST TWO-THIRDS OF
THE TOTAL  NUMBER OF  SHARES THEN  OUTSTANDING  ON A  FULLY DILUTED  BASIS  (THE
"MINIMUM  CONDITION"). THE  OFFER IS  SUBJECT TO  CERTAIN OTHER  CONDITIONS. SEE
SECTIONS 1, 13 AND 16.
 
    Wheat, First  Securities, Inc.,  has  delivered to  the Company's  Board  of
Directors  its opinion that the consideration to be received by the shareholders
of the Company pursuant to the Offer and the Merger is fair to such shareholders
from a financial point of  view. The Purchaser has  been advised by the  Company
that  a copy  of such opinion  will be set  forth in  full as an  exhibit to the
Company's Solicitation/Recommendation Statement on Schedule 14D-9 (the "Schedule
14D-9") which is being distributed  to the Company's shareholders.  Shareholders
are  urged  to  read  the opinion  in  its  entirety for  a  description  of the
assumptions made, matters considered and limitations of the review undertaken by
Wheat, First Securities, Inc.
 
    The purpose of  the Offer is  to facilitate  the acquisition of  all of  the
outstanding  Shares and thereby  to enable Purchaser to  acquire control of, and
the entire equity interest in,  the Company. The Offer  will be followed by  the
Merger  which will  enable the Purchaser  to acquire all  outstanding Shares not
tendered and  purchased  pursuant to  the  Offer  or acquired  pursuant  to  the
Shareholder Tender Agreement (as hereinafter defined).
 
    The  Offer is being made  pursuant to an Acquisition  Agreement, dated as of
June 15, 1996 (the "Acquisition Agreement"), by and among Varlen, the  Purchaser
and  the  Company. Pursuant  to the  Acquisition Agreement,  and subject  to the
satisfaction or waiver of  the conditions set forth  therein, the Purchaser  has
agreed  to make the Offer  and purchase any and  all Shares validly tendered and
not withdrawn following the  later of (i) the  expiration or termination of  all
waiting  periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended (the  "HSR Act"),  applicable to the  Offer and  (ii) the  Expiration
Date.  After the completion of the Offer,  the Purchaser will be merged with and
into the Company  (the "Merger")  and each  Share then  outstanding (other  than
Shares  held by Varlen,  the Purchaser or  any direct or  indirect subsidiary of
Varlen, the  Purchaser  or  the  Company,  and  Shares  with  respect  to  which
dissenter's  rights under  the Virginia Stock  Corporation Act,  as amended (the
"Virginia Act") are properly exercised) will be converted upon effectiveness  of
the

Merger (the "Effective Time") into the right to receive $16.125 in cash, without
any  interest.  Following  the  consummation of  the  Merger,  the  Company will
continue as the surviving corporation and  will be a wholly owned subsidiary  of
Varlen.
 
    The  Acquisition Agreement provides  that, promptly upon  the acceptance for
payment of,  and payment  by the  Purchaser in  accordance with  the Offer  for,
Shares  constituting 50% or more of all  Shares then outstanding pursuant to the
Offer, and  from time  to time  thereafter, the  Purchaser will  be entitled  to
designate  such number of directors, rounded up to the next whole number, on the
Board of Directors of the Company  as will give the Purchaser representation  on
the  Board of Directors equal to at  least that number of directors which equals
the product  of  the  total  number  of directors  on  the  Board  of  Directors
multiplied  by the percentage that such number of Shares so accepted for payment
and paid for or owned  by Varlen or the Purchaser  bears to the total number  of
Shares  outstanding; PROVIDED, HOWEVER, that the  Purchaser shall have the right
(in its discretion) to designate a  number of directors less than such  product;
AND PROVIDED FURTHER, HOWEVER, that at all times prior to the Merger there shall
be at least two members of the Board of Directors of the Company selected by the
current  members of  such Board. In  the Acquisition Agreement,  the Company has
agreed to use its best efforts to cause the Purchaser's designees to be  elected
to  the  Company's  Board  of  Directors  (including  mailing  to  the Company's
shareholders the  information  required  by  Section  14(f)  of  the  Securities
Exchange  Act  of  1934,  as  amended  (the  "Exchange  Act"),  and  Rule  14f-1
promulgated thereunder) and  to use  its reasonable  best efforts  to cause  the
resignation  of  current directors,  and/or  an increase  in  the number  of the
Company's directors, as may be directed by Varlen and required to implement  the
foregoing.
 
    The  Merger is subject to the satisfaction of various conditions, including,
among other things,  approval by  the shareholders  of the  Company if  required
under  the Virginia Act. If the Purchaser acquires the number of Shares required
to satisfy the Minimum Condition, it will control two-thirds of the  outstanding
Shares  on  a  fully  diluted  basis.  Accordingly,  the  Purchaser  would  have
sufficient voting power to  approve the Merger at  a meeting of shareholders  to
vote  thereon. In the  event that as a  result of the Offer,  Varlen owns 90% or
more of the outstanding Shares, the Purchaser and Varlen would be able to effect
the Merger pursuant  to the  short form merger  provisions of  the Virginia  Act
without  any action by any other shareholder  of the Company, but subject to the
requirements of the  Virginia Act that  a copy of  the Acquisition Agreement  be
mailed  to shareholders and  to the applicable  dissenter's rights provisions of
the Virginia Act.
 
    In connection with the Merger, the Company has agreed that it shall take all
action necessary,  in accordance  with  the Virginia  Act  and its  charter  and
bylaws,  to convene a meeting of its  shareholders as promptly as practicable to
consider and vote upon the Merger (if and to the extent required by the Virginia
Act), and to not take any action  which would result in the affirmative vote  of
shareholders  required for approval of the  Merger to be greater than two-thirds
of the votes entitled to be cast. Unless in the written opinion of legal counsel
to the Company (the delivery of which shall be confirmed in writing to Varlen by
such counsel) any of  the following actions would  create a substantial risk  of
violating  the fiduciary duties of the Board of Directors to the shareholders of
the Company, the  Company has  also agreed: (i)  that the  proxy or  information
statement  with respect  to any meeting  of the Company's  shareholders or other
corporate action  to approve  the Acquisition  Agreement and  the Merger,  shall
contain  the recommendation of  the Board of Directors  that the shareholders of
the Company vote to adopt and approve the Merger and the Acquisition  Agreement,
and (ii) if proxies are solicited, to use its reasonable best efforts to solicit
from its shareholders proxies in favor of such adoption and approval and to take
all  other action necessary or, in the reasonable judgment of Varlen, helpful to
secure the  vote or  consent of  shareholders required  by the  Virginia Act  to
effect  the Merger. At such meeting of  the shareholders of the Company, Varlen,
the Purchaser and their  direct and indirect subsidiaries  will vote all of  the
Shares then owned by any of them in favor of the Merger.
 
    Holders  of Shares may, in certain  circumstances, have a statutory right to
dissent from the Merger and  demand the "fair value"  of their Shares under  the
Virginia Act, provided they follow the
 
                                       2

procedures  established by the Virginia Act  to exercise and perfect such right.
Any dissenting  shareholders will  have only  such rights  and privileges  as  a
shareholder  of the  Company as are  provided for under  Article 15 (DISSENTER'S
RIGHTS) of the Virginia Act. See Section 11.
 
    Simultaneously with entering into the Acquisition Agreement, Varlen  entered
into  a Shareholder Tender  Agreement (the "Shareholder  Tender Agreement") with
certain shareholders of  the Company (the  "Tendering Shareholders"),  including
Needham  B. Whitfield, Chairman and Chief Executive Officer of the Company, Anne
Whitfield Kenny (whose husband,  John C. Kenny, is  a director of the  Company),
and  certain members (and  trusts for the  benefit of members)  of their family.
Pursuant to the  Shareholder Tender  Agreement, each  Tendering Shareholder  has
agreed  to tender (subject to certain possible exceptions) pursuant to the Offer
and before the Expiration Date all of the Shares owned of record or beneficially
by such Tendering Shareholder (except for  50,000 Shares in the aggregate  which
may  be contributed to charity) on the date of the Shareholder Tender Agreement,
together with any Shares acquired by any such Tendering Shareholder prior to the
termination of the  Shareholder Tender  Agreement. As  of the  date hereof,  the
Tendering Shareholders beneficially own 2,108,343 Shares, or approximately 20.7%
of all outstanding Shares.
 
    The  Acquisition  Agreement and  the Shareholder  Tender Agreement  are more
fully described  in Section  11  of this  Offer  to Purchase.  Shareholders  are
encouraged  to read  that Section carefully,  together with all  other terms and
conditions of the Offer, before deciding whether to tender their Shares.
 
    According to the Company, on June 14, 1996 there were (i) 10,207,440  Shares
(including  62,576 restricted Shares issued pursuant to the Company's restricted
stock plan) outstanding, and (ii) 442,000 shares reserved for issuance upon  the
exercise  of outstanding stock  options issued pursuant  to Company stock option
plans. As  of  the date  of  this Offer  to  Purchase, a  subsidiary  of  Varlen
beneficially  owns 460,000 Shares. Based on the foregoing, the Minimum Condition
will be satisfied  if 6,639,627 Shares  are validly tendered  and not  withdrawn
prior to the Expiration Date.
 
    THE  OFFER WILL EXPIRE AT  12:00 MIDNIGHT, NEW YORK  CITY TIME, ON THURSDAY,
JULY 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
    THE OFFER DOES NOT CONSTITUTE A SOLICITATION OF PROXIES FOR ANY MEETING. ANY
SUCH SOLICITATION WOULD BE MADE ONLY PURSUANT TO SEPARATE PROXY OR  SOLICITATION
MATERIALS  COMPLYING WITH THE REQUIREMENTS OF SECTION 14(A) OF THE EXCHANGE ACT,
AND THE RULES AND REGULATIONS PROMULGATED THEREUNDER.
 
                                       3

    THIS OFFER  TO  PURCHASE  AND  THE RELATED  LETTER  OF  TRANSMITTAL  CONTAIN
IMPORTANT INFORMATION WHICH SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE
WITH RESPECT TO THE OFFER.
 
    1.   TERMS OF THE OFFER; EXPIRATION DATE.  Upon the terms and subject to the
conditions set  forth in  the Offer  (including,  if the  Offer is  extended  or
amended,  the terms and conditions of any extension or amendment), the Purchaser
will accept for payment and will pay for any and all Shares validly tendered  on
or  prior to the Expiration Date and  not withdrawn in accordance with Section 3
of this Offer to Purchase. The term "Expiration Date" means 12:00 midnight,  New
York  City time, on Thursday,  July 18, 1996, unless  the Purchaser, in its sole
discretion, shall have extended the period of time for which the Offer is  open,
in which event the term "Expiration Date" shall mean the latest time and date at
which the Offer, as so extended by the Purchaser, shall expire. See Section 16.
 
    The  Offer  is  subject  to  certain conditions  set  forth  in  Section 13,
including  satisfaction  of  the  Minimum   Condition  and  the  expiration   or
termination  of the waiting period applicable  to the Purchaser's acquisition of
Shares pursuant  to  the Offer  under  the HSR  Act.  If any  condition  to  the
Purchaser's  obligation to purchase shares is not satisfied prior to the payment
for any such Shares, the  Purchaser may (i) terminate  the Offer and return  all
tendered Shares to tendering shareholders, (ii) extend the Offer and, subject to
withdrawal  rights as set forth  in Section 3, retain  all such Shares until the
expiration of the Offer as so extended, (iii) waive such condition and,  subject
to  any requirement to extend the period of time during which the Offer is open,
purchase all Shares validly tendered by  the Expiration Date and not  withdrawn,
or  (iv)  delay acceptance  for payment  of  or payment  for Shares,  subject to
applicable law, until satisfaction or waiver of the conditions of the Offer.
 
    The Acquisition Agreement provides that,  unless previously approved by  the
Company,  the Purchaser will not reduce the  price to be paid per Share pursuant
to the Offer, change the  form of consideration to be  paid in the Offer or  the
Merger,  increase  the  Minimum  Condition  or  amend  the  terms  of  the Offer
(including any of the conditions  set forth in Section 13)  in a manner that  is
materially  adverse  to  the  holders  of  Shares.  For  a  description  of  the
Purchaser's right to extend the period of  time during which the Offer is  open,
and to amend, delay or terminate the Offer, see Section 16.
 
    The  Company has provided the Purchaser  with the Company's shareholder list
and security position  listings for the  purpose of disseminating  the Offer  to
holders  of Shares. This Offer to Purchase and the related Letter of Transmittal
will be mailed to  record holders of  Shares and will  be furnished to  brokers,
dealers,  banks and similar persons whose names, or the names of whose nominees,
appear on the shareholder list or, if applicable, who are listed as participants
in a clearing agency's security position listing, for subsequent transmittal  to
beneficial owners of Shares.
 
    2.  ACCEPTANCE OF AND PAYMENT FOR SHARES.  Upon the terms and subject to the
conditions  of the Offer  (including, if the  Offer is extended  or amended, the
terms and conditions  of any such  extension or amendment),  the Purchaser  will
purchase, by accepting for payment, and will pay for, any and all Shares validly
tendered  and  not  withdrawn  following  the later  of  (i)  the  expiration or
termination of all waiting periods under the HSR Act that are applicable to  the
purchase  of Shares  pursuant to  the Offer,  and (ii)  the Expiration  Date. In
addition, the Purchaser expressly reserves the right, in its sole discretion, to
delay the acceptance of, or payment for, Shares in order to comply, in whole  or
in  part, with  any applicable law.  See Section  15. In all  cases, payment for
Shares purchased pursuant to the Offer will be made only after timely receipt by
the Depositary  of  certificates  for  such Shares  or  timely  confirmation  of
book-entry  transfer  (a  "Book-Entry  Confirmation") of  such  Shares  into the
Depositary's account  at  The  Depository  Trust  Company  or  the  Philadelphia
Depository   Trust  Company   (each,  a   "Book-Entry  Transfer   Facility"  and
collectively, the "Book-Entry Transfer  Facilities") pursuant to the  procedures
set  forth  in Section  4,  a properly  completed  and duly  executed  Letter of
Transmittal (or a  manually signed  facsimile thereof) and  any other  documents
required by the Letter of Transmittal.
 
                                       4

    For  purposes of the Offer,  the Purchaser shall be  deemed to have accepted
for payment  (and  thereby  purchased)  tendered Shares  as,  if  and  when  the
Purchaser  gives oral  or written  notice to  the Depositary  of the Purchaser's
acceptance of such Shares for payment pursuant to the Offer. Payment for  Shares
purchased  pursuant to the Offer  will be made by  deposit of the purchase price
with the Depositary, which will act as agent for tendering shareholders for  the
purpose  of receiving  payment from the  Purchaser and  transmitting payments to
tendering shareholders. The Purchaser will not, under any circumstances, pay any
interest on the purchase price, regardless of any delay in making such payment.
 
    If any  tendered Shares  are not  purchased  pursuant to  the Offer,  or  if
certificates  are submitted for more Shares  than are tendered, certificates for
such unpurchased  Shares will  be  returned, without  expense to  the  tendering
shareholder (or, in the case of book-entry transfer within a Book-Entry Transfer
Facility,  such Shares  will be  credited to  an account  maintained within such
Book-Entry Transfer Facility), as promptly  as practicable after the  expiration
or termination of the Offer.
 
    The  Purchaser  will pay  all  stock transfer  taxes,  if any,  payable with
respect to the transfer  to it of  Shares purchased pursuant  to the Offer.  If,
however,  payment  of  the  purchase  price  is  to  be  made  to,  or  (in  the
circumstances permitted by the Offer) if unpurchased Shares are to be registered
in the name  of, any person  other than  the registered holder,  or if  tendered
certificates  are registered  in the  name of any  person other  than the person
signing any  Letter of  Transmittal,  the amount  of  any stock  transfer  taxes
(whether  imposed  on the  registered holder  or such  other person)  payable on
account of such payment  or transfer to  such person will  be deducted from  the
purchase  price unless  satisfactory evidence of  the payment of  such taxes, or
exemption therefrom, is submitted.
 
    The Purchaser expressly reserves the right  to transfer or assign to  Varlen
or  to one or more of Varlen's  direct or indirect wholly owned subsidiaries the
right to purchase  all or any  portion of  the Shares tendered  pursuant to  the
Offer,  but no  such transfer  or assignment will  relieve the  Purchaser of its
obligations under the Offer or prejudice the rights of tendering shareholders to
receive payment for Shares validly tendered and accepted for payment pursuant to
the Offer.
 
    If, prior to the  Expiration Date, the Purchaser  shall decide, in its  sole
discretion,  to increase the  consideration offered to  shareholders pursuant to
the Offer, such increased consideration shall  be paid to all holders of  Shares
accepted for payment and paid for pursuant to the Offer.
 
    3.  WITHDRAWAL RIGHTS.  Tenders of Shares made pursuant to the Offer will be
irrevocable,  except that Shares tendered may be  withdrawn at any time prior to
the Expiration Date  and, unless previously  accepted for payment,  may also  be
withdrawn  after August 18, 1996. If the  Purchaser is delayed in its acceptance
or purchase of or payment for Shares or is unable to purchase or pay for  Shares
for any reason, then, without prejudice to the Purchaser's rights under Sections
1, 13 and 16, tendered Shares may be retained by the Depositary on behalf of the
Purchaser  and may not  be withdrawn except  as permitted by  this Section 3 and
subject to Rule 14e-1(c) under the Exchange Act. See Section 16.
 
    For a withdrawal to be effective, a written or facsimile transmission notice
of withdrawal must be timely received by the Depositary at one of its  addresses
specified  on  the back  cover of  this Offer  to Purchase.  Any such  notice of
withdrawal must specify the  name of the  person who tendered  the Shares to  be
withdrawn,   the  number  of  Shares  to   be  withdrawn  and,  if  certificates
representing such  Shares have  been delivered  or otherwise  identified to  the
Depositary,  the name(s)  in which such  certificate(s) is  (are) registered, if
different from the  name of the  person tendering such  Shares. If  certificates
have been delivered or otherwise identified to the Depositary, then prior to the
physical  release  of such  certificates,  the tendering  shareholder  must also
submit the serial numbers shown  on the particular certificates evidencing  such
Shares  and the signature  on the notice  of withdrawal must  be guaranteed by a
member firm  of a  registered  national securities  exchange,  a member  of  the
National  Association of  Securities Dealers, Inc.,  a commercial  bank or trust
company having an office,  branch or agency  in the United  States or any  other
institution  that is a member of  the Medallion Signature Guaranty Program (each
being  referred   to   herein  as   an   "Eligible  Institution").   If   Shares
 
                                       5

have  been tendered pursuant to the procedure for book-entry tender as set forth
in Section  4,  the notice  of  withdrawal must  specify  the name  and  account
number(s) of the account(s) at the applicable Book-Entry Transfer Facility to be
credited with the withdrawn Shares, in which case a notice of withdrawal will be
effective  if delivered to the Depositary by any method of delivery described in
the first sentence of this paragraph. None of Varlen, the Purchaser, the  Dealer
Manager,  the  Depositary or  the Information  Agent will  be obligated  to give
notice of any defects or irregularities  in any notice of withdrawal, nor  shall
any  of  them incur  any  liability for  failure to  give  any such  notice. All
questions as to the form and validity (including time of receipt) of notices  of
withdrawal  will be determined  by the Purchaser, in  its sole discretion, whose
determination shall be final and binding.
 
    Withdrawals of Shares tendered may not be rescinded, and any Shares properly
withdrawn will thereafter  be deemed not  validly tendered for  purposes of  the
Offer.  Withdrawn Shares,  however, may  be retendered  by following  one of the
procedures described in Section 4 at any time prior to the Expiration Date.
 
    4.  PROCEDURES FOR ACCEPTING THE OFFER AND TENDERING SHARES.
 
    VALID TENDER.   In order for  a holder  of Shares to  validly tender  Shares
pursuant  to  the  Offer,  a  properly completed  and  duly  executed  Letter of
Transmittal (or a manually signed facsimile thereof), together with any required
signature  guarantees  and  any  other  documents  required  by  the  Letter  of
Transmittal,  must be  received by  the Depositary at  one of  its addresses set
forth on the back cover of this Offer to Purchase, on or prior to the Expiration
Date. Either  (i) the  certificates for  such Shares  must be  delivered to  the
Depositary  or (ii) such Shares  must be tendered pursuant  to the procedure for
book-entry transfer  set  forth below  and  a Book-Entry  Confirmation  must  be
received  by the Depositary (including an Agent's Message (as defined below), if
the tendering shareholder has  not delivered a Letter  of Transmittal), in  each
case  on or prior to the Expiration  Date. Delivery of documents to a Book-Entry
Transfer Facility does not constitute delivery to the Depositary. Alternatively,
the tendering shareholder may comply with the guaranteed delivery procedure  set
forth  below.  The  term "Agent's  Message"  means  a message  transmitted  by a
Book-Entry Transfer Facility  to and received  by the Depositary  and forming  a
part  of a Book-Entry  Confirmation, which states  that such Book-Entry Transfer
Facility has  received an  express  acknowledgement from  a participant  in  the
system  established by  such Book-Entry  Transfer Facility  tendering the Shares
which are the subject of such Book-Entry Confirmation that such participant  has
received  and agrees to be  bound by the terms of  the Letter of Transmittal and
that  the  Purchaser  may  enforce  such  Letter  of  Transmittal  against  such
participant.
 
    BOOK-ENTRY  TRANSFER.  The Depositary will establish an account with respect
to the Shares  at each Book-Entry  Transfer Facility for  purposes of the  Offer
within  two business  days after  the date  of this  Offer to  Purchase, and any
financial institution that is a participant in a Book-Entry Transfer  Facility's
system  may make  book-entry transfer  of the  Shares by  causing the Book-Entry
Transfer Facility  to transfer  such  Shares into  the Depositary's  account  in
accordance with such Book-Entry Transfer Facility's procedure for such transfer.
Even  if delivery of Shares  is to be effected  through book-entry transfer at a
Book-Entry Transfer Facility, the  Letter of Transmittal  (or a manually  signed
facsimile  thereof) along with  any required signature  guarantees and any other
required documents, or an Agent's Message,  must be transmitted to and  received
by  the Depositary at one of  its addresses set forth on  the back cover page of
this Offer to Purchase on  or prior to the  Expiration Date, or the  shareholder
must comply with the guaranteed delivery procedure set forth below.
 
    SIGNATURE  GUARANTEES.    If the  Letter  of  Transmittal is  signed  by the
registered holder of  the Shares tendered  therewith and payment  is to be  made
directly to such registered holder, or if Shares are tendered for the account of
an Eligible Institution, no signature guarantee is required. In all other cases,
signatures  on  the Letter  of  Transmittal must  be  guaranteed by  an Eligible
Institution. If certificates are registered in  the name of a person other  than
the  signer  of the  Letter  of Transmittal,  or  if payment  is  to be  made or
certificates for  Shares not  accepted for  payment or  not tendered  are to  be
returned to a person other than the registered holder, then certificates must be
endorsed or
 
                                       6

accompanied  by appropriate stock  powers, in either case  signed exactly as the
name or the names of the registered owner or owners appear on certificates, with
the signature(s) on the  certificates or stock  powers guaranteed as  aforesaid.
See Instructions 1 and 5 of the Letter of Transmittal.
 
    GUARANTEED  DELIVERY.  If a shareholder desires to tender Shares pursuant to
the Offer and such holder's certificates are not immediately available, or  time
will  not permit all required  documents to reach the  Depositary on or prior to
the Expiration  Date,  or  the  procedure  for  book-entry  transfer  cannot  be
completed  on a timely basis, such Shares may nevertheless be tendered if all of
the following conditions are met:
 
        (i) such tenders are made by or through an Eligible Institution;
 
        (ii) a  properly  completed  and  duly  executed  Notice  of  Guaranteed
    Delivery  substantially in the form provided by the Purchaser is received by
    the Depositary as provided below by the Expiration Date; and
 
       (iii) the  certificates  for  all  tendered Shares  in  proper  form  for
    transfer  (or a Book-Entry Confirmation), together with a properly completed
    and duly  executed Letter  of Transmittal  (or a  manually signed  facsimile
    thereof)  with  any required  signature  guarantee and  any  other documents
    required by the Letter of Transmittal,  or an Agent's Message, are  received
    by  the Depositary within three  National Association of Securities Dealers,
    Inc. Automated Quotation System trading days after the date of execution  of
    such Notice of Guaranteed Delivery.
 
    The  Notice  of Guaranteed  Delivery may  be  delivered by  hand, or  may be
transmitted by facsimile transmission,  or by mail, to  the Depositary and  must
include  a guarantee  by an Eligible  Institution in  the form set  forth in the
Notice of Guaranteed Delivery.
 
    In all cases,  payment for  Shares tendered  and purchased  pursuant to  the
Offer  will be made only after timely  receipt by the Depositary of certificates
for such Shares (or a timely Book-Entry Confirmation), a properly completed  and
duly executed Letter of Transmittal (or a manually signed facsimile thereof) and
any other documents required by the Letter of Transmittal.
 
    OTHER  REQUIREMENTS.   By  executing a  Letter of  Transmittal as  set forth
above, a tendering shareholder irrevocably  appoints designees of the  Purchaser
as  his proxies, in  the manner set forth  in the Letter  of Transmittal, to the
full extent of such shareholder's rights with respect to the Shares tendered  by
such  shareholder and purchased by  the Purchaser (and any  and all other Shares
and other securities issued or issuable in respect thereof on or after June  15,
1996)  prior  to the  time of  any shareholder  vote or  other action.  All such
proxies shall  be irrevocable  and  coupled with  an  interest in  the  tendered
Shares.  Such appointment will be  effective when, and only  to the extent that,
the Purchaser accepts such Shares for payment. Upon such appointment, all  prior
proxies given by such shareholder with respect to such purchased Shares or other
securities will be revoked and no subsequent proxies may be given. The designees
of  the Purchaser  will, with  respect to such  Shares and  other securities, be
empowered to exercise all voting and  other rights of such shareholder as  they,
in  their sole discretion, may  deem proper at any  annual, special or adjourned
meeting of  the Company's  shareholders, by  written consent  or otherwise.  The
Purchaser  reserves the right to require that, in order for Shares to be validly
tendered, immediately  upon  the acceptance  for  payment of  such  Shares,  the
Purchaser  be able  to exercise  full voting  and other  rights of  a record and
beneficial holder, including  rights in  respect of acting  by written  consent,
with  respect to  such Shares  (and any  and all  other securities  as set forth
above).
 
    THE METHOD  OF  DELIVERY OF  ALL  DOCUMENTS, INCLUDING  DELIVERY  THROUGH  A
BOOK-ENTRY  TRANSFER  FACILITY, IS  AT THE  ELECTION AND  RISK OF  THE TENDERING
SHAREHOLDER. IF  DELIVERY IS  TO BE  BY MAIL,  INSURED REGISTERED  MAIL,  RETURN
RECEIPT  REQUESTED  IS  RECOMMENDED.  AMPLE  TIME  SHOULD  BE  ALLOWED  FOR SUCH
DOCUMENTS TO REACH THE DEPOSITARY. EXCEPT AS OTHERWISE PROVIDED IN THIS  SECTION
4, DELIVERY WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE DEPOSITARY.
 
                                       7

    BACK-UP  FEDERAL INCOME TAX WITHHOLDING.  Under the federal income tax laws,
the Depositary will be required  to withhold 31% of  the amount of any  payments
made  to  certain shareholders  pursuant to  the Offer.  To prevent  such backup
federal  income  tax  withholding,  each  such  shareholder  must  provide   the
Depositary with his correct taxpayer identification number and certify that such
shareholder  is  not  subject  to  such  backup  withholding  by  completing the
Substitute Form W-9 included in the Letter of Transmittal.
 
    DETERMINATION OF  VALIDITY.    All  questions  as  to  the  validity,  form,
eligibility (including time of receipt) and acceptance for payment of any tender
of  Shares  will  be determined  by  the  Purchaser and  Varlen,  in  their sole
discretion, whose determination  will be  final and binding.  The Purchaser  and
Varlen  reserve the absolute  right to reject  any or all  tenders determined by
them not to be in proper form or the acceptance of or payment for which may,  in
the  opinion of the  Purchaser's counsel, be unlawful.  The Purchaser and Varlen
also reserve the absolute right to waive  any of the conditions of the Offer  or
any defect in any tender with respect to any particular Shares or any particular
shareholder.  No tender of Shares will be deemed to have been validly made until
all defects and irregularities relating thereto have been cured or waived.  None
of  Varlen, the Purchaser, the Dealer Manager, the Depositary or the Information
Agent will  be obligated  to give  notice of  any defects  or irregularities  in
tenders,  nor shall any of them incur any liability for failure to give any such
notice. The Purchaser's and Varlen's interpretation of the terms and  conditions
of the Offer (including the Letter of Transmittal and instructions thereto) will
be final and binding.
 
    5.    CERTAIN INCOME  TAX  CONSEQUENCES.   The  receipt of  cash  for Shares
pursuant to the Offer or for Shares  pursuant to the Merger will be taxable  for
federal  income tax purposes  and may be taxable  under applicable state, local,
foreign and  other tax  laws. The  tax  consequences of  such receipt  may  vary
depending  upon,  among  other  things,  the  particular  circumstances  of  the
shareholder. In general, a shareholder will recognize gain or loss equal to  the
difference between the amount of cash received and his tax basis for his Shares.
Such  gain or  loss will generally  be capital  gain or loss  provided that such
shareholder held his Shares  as a capital asset,  and will be long-term  capital
gain  or loss if, on the  date of sale, such Shares  were held for more than one
year. Otherwise, such gain or loss will be short-term capital gain or loss.
 
    The foregoing  may not  be  applicable to  shareholders who  acquired  their
Shares  pursuant  to the  exercise  of employee  stock  options or  otherwise as
compensation or who are not  citizens or residents of  the United States or  who
are  otherwise subject to special tax  treatment under the Internal Revenue Code
of 1986, as amended (such as  life insurance companies, tax exempt entities  and
regulated investment companies).
 
    THE  FEDERAL INCOME TAX  DISCUSSION SET FORTH ABOVE  IS INCLUDED FOR GENERAL
INFORMATION ONLY. EACH SHAREHOLDER IS URGED  TO CONSULT HIS OWN TAX ADVISORS  TO
DETERMINE  PARTICULAR  TAX CONSEQUENCES  OF  THE OFFER  AND  THE MERGER  TO SUCH
SHAREHOLDER, INCLUDING THE EFFECT AND APPLICABILITY OF STATE, LOCAL, FOREIGN AND
OTHER TAX LAWS.
 
                                       8

    6.   MARKET PRICES  OF SHARES;  DIVIDENDS.   The Shares  are traded  in  the
over-the-counter  market, under the symbol "BREN."  The Shares are quoted in the
National Association of  Securities Dealers, Inc.  ("NASD") Automated  Quotation
System  ("NASDAQ") National Market  System. The following  table sets forth, for
the calendar periods  shown, the  range of  high and  low sales  prices for  the
Shares  as quoted in the NASDAQ National Market System for such periods, in each
case as reported by published financial  sources, and the cash dividend paid  by
the  Company for  each such  quarter. NASDAQ  National Market  System quotations
reflect inter-dealer prices,  without retail mark-up,  mark-down or  commission,
and do not necessarily reflect actual transactions.
 


                                                                          QUARTERLY
                                                     HIGH       LOW       DIVIDEND
                                                   --------   --------   -----------
                                                             
YEAR ENDED DECEMBER 31, 1994
  1st    Quarter.................................  $12 1/2    $ 8 1/4     $     .05
  2nd    Quarter.................................   13 1/4      9 1/8           .05
  3rd    Quarter.................................   14         11 1/2           .06
  4th    Quarter.................................   13 1/4     11 1/4           .06
YEAR ENDED DECEMBER 31, 1995
  1st    Quarter.................................  $13        $10 5/8     $     .06
  2nd    Quarter.................................   14 1/4     12               .07
  3rd    Quarter.................................   12 5/8      9 3/16          .07
  4th    Quarter.................................   12         10 1/8           .07
YEAR ENDING DECEMBER 31, 1996
  1st    Quarter.................................  $12 13/16  $ 9         $     .07
  2nd    Quarter (through June 19, 1996).........   16 1/4     12 1/8        --

 
    On  June 14, 1996, the last full day of trading prior to the announcement of
the Purchaser's intention to  make the Offer, the  last reported sale price  for
the  Shares, as reported  in the NASDAQ  National Market System,  was $12.25 per
Share, according to published sources. SHAREHOLDERS ARE URGED TO OBTAIN  CURRENT
MARKET QUOTATIONS FOR THE SHARES.
 
    7.   CERTAIN EFFECTS OF  THE OFFER.  The purchase  of Shares pursuant to the
Offer will reduce the number of  Shares that might otherwise trade publicly  and
may  also be expected to reduce the number of holders of Shares. Such reductions
could adversely affect the  liquidity and market value  of the remaining  Shares
held by the public.
 
    NASDAQ  QUOTATION.  Depending on the  number of Shares purchased pursuant to
the Offer,  the Shares  may no  longer meet  the requirements  of the  NASD  for
continued inclusion in the NASDAQ National Market System (the top tier market of
The  NASDAQ Stock Market),  which require that  an issuer have  at least 200,000
publicly held shares, held by at  least 400 shareholders or 300 shareholders  of
round  lots, with a market value of  $1,000,000, and have net tangible assets of
at least either $1,000,000, $2,000,000 or $4,000,000, depending on profitability
levels during the issuer's four most recent fiscal years. If these standards are
not met, the  Shares might nevertheless  continue to be  included in the  NASD's
NASDAQ  Stock Market, with quotations published  in the NASDAQ "additional list"
or in one of the "local lists", but if the number of holders of the Shares  were
to  fall below 300, or if the number  of publicly held Shares were to fall below
100,000 or there were not at least  two registered and active market makers  for
the  Shares,  the  NASD's rules  provide  that  the Shares  would  no  longer be
"qualified"  for  NASDAQ  reporting  and  NASDAQ  would  cease  to  provide  any
quotations.  Shares  held  directly  or  indirectly  by  directors,  officers or
beneficial owners of more  than 10% of  the Shares are  not considered as  being
publicly  held  for this  purpose. If,  as a  result of  the purchase  of Shares
pursuant to the Offer, the  Shares no longer meet  the requirements of the  NASD
for continued inclusion in The NASDAQ Stock Market or the NASDAQ National Market
System, as the case may be, the market for Shares could be adversely affected.
 
    In the event that the Shares no longer meet the requirements of the NASD for
quotation  through NASDAQ and  the Shares are  no longer included  in The NASDAQ
Stock Market, it  is possible that  the Shares  would continue to  trade in  the
over-the-counter market and that price quotations would be
 
                                       9

reported  by other sources. The  extent of the public  market for the Shares and
the availability of such  quotations would, however, depend  upon the number  of
holders  of Shares remaining at such time, the interests in maintaining a market
in Shares  on  the  part  of  securities  firms,  the  possible  termination  of
registration of the Shares under the Exchange Act, as described below, and other
factors.  The Purchaser  has been advised  by the  Company that, as  of June 15,
1996, there were approximately 1,951 record holders of Shares.
 
    EXCHANGE ACT REGISTRATION.   The Shares are  currently registered under  the
Exchange  Act.  Such  registration may  be  terminated upon  application  of the
Company to  the Securities  and Exchange  Commission (the  "Commission") if  the
Shares are not listed on a national securities exchange and there are fewer than
300  record holders of  Shares. Termination of registration  of the Shares under
the Exchange  Act would  substantially  reduce the  information required  to  be
furnished  by the Company to its shareholders  and the Commission and would make
certain provisions of the Exchange Act (such as the short-swing profit  recovery
provisions  of  Section  16(b) and  the  requirement  of furnishing  a  proxy or
information statement  in connection  with  shareholders' meetings  pursuant  to
Section  14(a) or (c) and the related requirement of an annual report) no longer
applicable to  the Company.  Furthermore,  the ability  of "affiliates"  of  the
Company and persons holding "restricted securities" of the Company to dispose of
such  securities  pursuant  to  Rule  144 or  Rule  144A  promulgated  under the
Securities Act of 1933, as amended, may be impaired or, with respect to  certain
persons,  eliminated. If,  as a  result of  purchases pursuant  to the  Offer or
otherwise, the Company  is no longer  required to maintain  registration of  the
Shares  under the Exchange  Act, the Purchaser  intends to cause  the Company to
apply for termination of such registration. See Section 11.
 
    MARGIN REGULATIONS.  The Shares are presently "margin securities" under  the
rules  of the  Board of  Governors of the  Federal Reserve  System (the "Federal
Reserve Board"), which has the effect,  among other things, of allowing  brokers
to extend credit on the collateral of such securities for the purpose of buying,
carrying  or  trading in  securities ("Purpose  Loans"). In  the event  that the
Shares were no longer quoted in the NASDAQ National Market System (which depends
on factors such as the number of holders of the Shares and the number and market
value of publicly-held Shares (see NASDAQ QUOTATION above)), the Shares would no
longer constitute  "margin  securities"  for purposes  of  the  Federal  Reserve
Board's margin regulations and, therefore, could no longer be used as collateral
for  Purpose Loans made by  brokers. In addition, if  registration of the Shares
under the Exchange Act  were terminated, the Shares  would no longer  constitute
"margin securities."
 
    RULE  13E-3.  The Commission has adopted  Rule 13e-3 under the Exchange Act,
which is applicable to certain "going private" transactions and which may  under
certain  circumstances  be  applicable  to  the  Merger  or  other  transactions
following the purchase of  Shares pursuant to the  Offer in which the  Purchaser
seeks  to acquire the remaining shares not held by it. However, Rule 13e-3 would
be inapplicable if (i) the Shares are deregistered under the Exchange Act  prior
to  the Merger  or other  transactions or  (ii) the  Merger or  another business
combination is consummated  within one  year after  the purchase  of the  Shares
pursuant  to the Offer and the amount paid  per Share for each class of Share in
the Merger or other business  combination is at least  equal to the amount  paid
per  Share  for such  class of  Share in  the Offer.  If applicable,  Rule 13e-3
requires, among other things, that certain financial information concerning  the
fairness  of the proposed transaction and  the consideration offered to minority
shareholders in such transaction be filed  with the Commission and disclosed  to
shareholders prior to the consummation of the transaction.
 
    8.   CERTAIN INFORMATION CONCERNING THE COMPANY.   The Company is a Virginia
corporation with  its  principal executive  offices  located at  One  Park  West
Circle,  Midlothian,  Virginia  23113, telephone  (804)  794-1436.  According to
information filed by the Company with  the Commission, the Company is  primarily
engaged  in  the  manufacture,  sale  and  servicing  of  roller  bearings;  the
manufacture and  sale  of automotive  forgings;  the provision  of  third  party
railcar switching services; and the operation of short-line railroads.
 
                                       10

    Set  forth below is a summary of certain selected financial information with
respect to the Company and its subsidiaries for the fiscal years ended  December
31,  1995,  December 31,  1994 and  December  31, 1993  and for  the three-month
periods ended March 31,  1996 and March  31, 1995, which  has been excerpted  or
derived  from  the audited  consolidated financial  statements contained  in the
Company's Annual Reports on  Form 10-K for the  fiscal years ended December  31,
1995 and December 31, 1994, and from unaudited consolidated financial statements
contained  in the Company's Quarterly Report on  Form 10-Q for the quarter ended
March 31, 1996.  More comprehensive  financial information is  included in  such
reports  and other documents filed  by the Company with  the Commission, and the
following summary is qualified  in its entirety by  reference to such  documents
and all of the financial statements and related notes contained therein.
 
                              BRENCO, INCORPORATED
                         SELECTED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 


                                                       THREE MONTHS ENDED
                                                           MARCH 31,          FISCAL YEAR ENDED DECEMBER 31,
                                                      --------------------  -----------------------------------
                                                        1996       1995        1995         1994        1993
                                                      ---------  ---------  -----------  -----------  ---------
                                                          (UNAUDITED)
                                                                                       
INCOME STATEMENT DATA:
  Net sales.........................................  $  32,875  $  35,232  $   127,139  $   117,897  $  98,724
  Costs and expenses................................     28,825     29,224      110,177      102,727     89,413
  Interest expense..................................        178        214          723          799        741
  Income before income taxes........................      4,123      5,979       16,909       14,555      6,893
  Net income........................................      2,571      3,640       10,660        8,802      4,241
  Earnings per share:
    Net income per share............................        .25        .36         1.05          .88        .43
    Average shares outstanding......................     10,189     10,102       10,135       10,050      9,942
BALANCE SHEET DATA:
  Current assets....................................  $  56,780  $  49,171  $    49,520  $    41,968  $  36,900
  Total assets......................................     93,041     84,743       86,278       76,569     69,629
  Current liabilities...............................     11,962     12,297        8,438        7,530      8,312
  Long-term debt....................................      8,184      9,540        8,212        9,567     10,000
  Shareholders' equity..............................     66,134     58,777       63,999       55,498     48,289

 
    CERTAIN  COMPANY  PROJECTIONS.    Prior  to  entering  into  the Acquisition
Agreement, Varlen  conducted  a due  diligence  review  of the  Company  and  in
connection  with such review received  certain non-public business and financial
information from  the  Company including  summary  business plans  comprised  of
income,  balance sheet  and cash  flow statements,  financial plans  and certain
historical data  detailing sales,  costs and  expenses and  balance sheet  data.
Certain  projected information included in the non-public business and financial
records of the  Company included  that (i)  net sales  for the  Company for  the
fiscal  years ending December 31, 1996  through 1998 would be approximately $125
million, $124 million and $130 million, respectively and (ii) net income for the
Company for the  fiscal years  ending December 31,  1996 through  1998 would  be
approximately  $9.6 million, $9.7 million  and $10.3 million, respectively. None
of the  assumptions which  form the  basis for  the projected  information  give
effect  to  the Offer,  the Merger  or  the financing  thereof or  the potential
combined operations  of  Varlen  and  the Company  after  consummation  of  such
transactions.
 
    THE  COMPANY  HAS  ADVISED THAT  THE  ABOVE PROJECTIONS  AND  FORECASTS WERE
PREPARED FOR INTERNAL PURPOSES ONLY, WERE NOT PREPARED WITH A VIEW TO COMPLIANCE
WITH THE  COMMISSION'S PUBLISHED  GUIDELINES FOR  DISCLOSURE OF  FORWARD-LOOKING
INFORMATION OR THE GUIDELINES ESTABLISHED BY THE AMERICAN INSTITUTE OF CERTIFIED
PUBLIC  ACCOUNTANTS  REGARDING PROJECTIONS,  AND  WERE NOT  INTENDED  FOR PUBLIC
DISSEMINATION. THE FOREGOING PROJECTIONS AND FORECASTS ARE NECESSARILY BASED  ON
ASSUMPTIONS AS TO FACTS WHICH ARE NOT WITHIN THE COMPANY'S CONTROL. NO ASSURANCE
CAN   BE  GIVEN   THAT  SUCH   PROJECTIONS  OR   FORECASTS  WILL   PROVE  TO  BE
 
                                       11

ACCURATE TO ANY EXTENT AND NONE OF VARLEN, THE PURCHASER, THE COMPANY OR ANY  OF
THEIR  RESPECTIVE  ADVISORS OR  ANY OTHER  PARTY  WHO RECEIVED  SUCH INFORMATION
ASSUMES ANY RESPONSIBILITY FOR  THE ACCURACY OF  SUCH PROJECTIONS OR  FORECASTS.
VARLEN  AND THE  PURCHASER HAVE INCLUDED  SUCH PROJECTIONS  AND FORECASTS HEREIN
ONLY BECAUSE VARLEN WAS PROVIDED THEM PRIOR TO THE EXECUTION OF THE  ACQUISITION
AGREEMENT.  ALTHOUGH PRESENTED WITH NUMERICAL SPECIFICITY, THESE PROJECTIONS AND
FORECASTS ARE BASED UPON A VARIETY OF ASSUMPTIONS RELATING TO THE BUSINESSES  OF
THE   COMPANY  WHICH  MAY  NOT  BE  REALIZED  AND  ARE  SUBJECT  TO  SIGNIFICANT
UNCERTAINTIES AND CONTINGENCIES,  MANY OF WHICH  ARE BEYOND THE  CONTROL OF  THE
COMPANY.  THERE CAN BE NO ASSURANCE THAT THE PROJECTIONS AND FORECASTS SET FORTH
ABOVE WILL BE REALIZED, AND ACTUAL RESULTS MAY VARY MATERIALLY FROM THOSE SHOWN.
THE PROJECTIONS  AND  FORECASTS  HAVE  NOT BEEN  EXAMINED  OR  COMPILED  BY  THE
COMPANY'S  INDEPENDENT PUBLIC ACCOUNTANTS. THE INCLUSION OF SUCH PROJECTIONS AND
FORECASTS HEREIN  SHOULD NOT  BE  REGARDED AS  AN  INDICATION THAT  VARLEN,  THE
PURCHASER,  THE COMPANY, ANY OF THEIR RESPECTIVE ADVISORS OR ANY OTHER PARTY WHO
RECEIVED SUCH INFORMATION CONSIDERS IT AN ACCURATE PREDICTION OF FUTURE EVENTS.
 
    Except where  otherwise  stated,  the  information  concerning  the  Company
contained in this Offer to Purchase or incorporated herein by reference has been
taken  from or based upon publicly-available  documents and records on file with
the Commission and other public sources or was provided by the Company. Although
the Purchaser has no knowledge that would indicate that any statements contained
herein based on such  documents and records are  untrue, neither Varlen nor  the
Purchaser  can  take  responsibility for  the  accuracy or  completeness  of the
information contained in such documents and  records, or for any failure by  the
Company   to  disclose  events  which  may  have  occurred  or  may  affect  the
significance or accuracy of any such information which are unknown to Varlen  or
the Purchaser.
 
    The  Company is subject to the information and reporting requirements of the
Exchange Act and in accordance therewith is obligated to file reports and  other
information  with the Commission  relating to its  business, financial condition
and other matters. Information, as of particular dates, concerning the Company's
business, principal  physical properties,  capital structure,  material  pending
legal   proceedings,  operating  results,  financial  condition,  the  Company's
directors and officers, their remuneration,  stock options and restricted  stock
granted to them, the principal holders of the Company's securities, any material
interests of such persons in transactions with the Company and other matters, is
required  to be disclosed in proxy  statements and annual reports distributed to
the Company's shareholders and  filed with the  Commission. Such reports,  proxy
statements  and other  information may be  inspected at  the Commission's public
reference facilities  at 450  Fifth Street,  N.W., Washington,  D.C. 20549,  and
should also be available for inspection at the following regional offices of the
Commission:  7 World Trade Center, Suite 1300, New York, New York 10048; and 500
West Madison Street,  Suite 1400,  Chicago, Illinois  60661; and  copies may  be
obtained,  by  mail,  for prescribed  rates  from  the principal  office  of the
Commission at 450 Fifth Street,  N.W., Washington, D.C. 20549. Such  information
should  also be  available for inspection  at the offices  of NASDAQ Operations,
1735 K Street, N.W., Washington, D.C. 20006.
 
    9.  CERTAIN INFORMATION CONCERNING THE PURCHASER AND VARLEN.  The  Purchaser
is  a newly incorporated  Virginia corporation and a  wholly owned subsidiary of
Varlen. To date, the Purchaser has engaged in no activities other than those  in
connection  with the Offer. The principal executive offices of the Purchaser and
Varlen are located at 55 Shuman Boulevard, P.O. Box 3089, Naperville,  Illinois,
60566-7089, telephone (708) 420-0400.
 
    The  name, business  address, citizenship,  present principal  employment or
occupation and  employment  history for  the  past five  years  of each  of  the
directors  and executive officers of  the Purchaser and Varlen  are set forth in
Schedule A to this Offer to Purchase.
 
    Varlen, a Delaware corporation, was formed in 1969. Varlen is a manufacturer
of (i) aluminum permanent  mold and die castings  and structural molded  plastic
components   for  trucks  and   trailers;  (ii)  components   for  railcars  and
locomotives; (iii) remanufactured crankshafts  and camshafts and railroad  track
fastener  systems; (iv) automatic transmission  reaction plates, steering column
and
 
                                       12

transmission  components,  seat  frame  brackets  and  precision  stamped  metal
components  and  weldments for  cars and  light trucks;  and (v)  instruments to
improve yield, certify products and  monitor regulatory standards for  petroleum
products.
 
    Except  as  set  forth in  this  paragraph  or elsewhere  in  this  Offer to
Purchase, and except for  460,000 shares beneficially owned  by a subsidiary  of
Varlen,  neither the Purchaser nor  Varlen nor, to the  best of their knowledge,
any of the persons  listed in Schedule  A hereto nor  any associate or  majority
owned  subsidiary of any of  the foregoing, beneficially owns  or has a right to
acquire any  equity securities  of the  Company and  neither the  Purchaser  nor
Varlen  nor, to  the best  of their  knowledge, any  of the  persons or entities
referred to above, nor any director,  executive officer or subsidiary of any  of
the foregoing, has effected any transaction in such equity securities during the
past 60 days.
 
    Except  as set forth  in this Offer  to Purchase, neither  the Purchaser nor
Varlen nor, to the best of the knowledge of Varlen and the Purchaser, any of the
persons  listed  in   Schedule  A   hereto,  has   any  contract,   arrangement,
understanding  or  relationship (whether  or not  legally enforceable)  with any
other person with respect to any  securities of the Company, including, but  not
limited  to, any contract, arrangement, understanding or relationship concerning
the transfer or the voting  of any of such  securities, joint ventures, loan  or
option  arrangements,  puts or  calls, guarantees  of loans,  guarantees against
loss, or the giving or withholding of proxies. Except as set forth in this Offer
to Purchase, there  have been  no contacts, negotiations  or transactions  which
have  occurred since January 1,  1993, between Varlen, the  Purchaser, or any of
Varlen's other subsidiaries or, to the best  of the knowledge of Varlen and  the
Purchaser,  any of the persons listed in Schedule A hereto, on the one hand, and
the Company  or  its  affiliates,  on the  other  hand,  concerning:  a  merger,
consolidation or acquisition; a tender offer or other acquisition of securities;
an  election of directors; or  a sale or other transfer  of a material amount of
assets. Except as described in this Offer to Purchase, neither the Purchaser nor
Varlen nor, to the best of the knowledge of Varlen and the Purchaser, any of the
persons listed  in  Schedule  A  hereto,  has since  January  1,  1993  had  any
transaction  with the  Company or  any of  its executive  officers, directors or
affiliates which would require disclosure under the rules and regulations of the
Commission applicable to the Offer.
 
    Except as set forth in this Offer  to Purchase, during the last five  years,
neither the Purchaser nor Varlen nor, to the best of the knowledge of Varlen and
the Purchaser, any of the persons listed on Schedule A (i) has been convicted in
a criminal proceeding (excluding traffic violations and similar misdemeanors) or
(ii)  was a party to a civil proceeding  of a judicial or administrative body of
competent jurisdiction and as a result of such proceeding was or is subject to a
judgment, decree or final order  enjoining future violations of, or  prohibiting
activities subject to, Federal or state securities laws or finding any violation
of such laws.
 
    Until  immediately  prior to  the time  the  Purchaser purchases  the Shares
pursuant to the Offer, it  is not anticipated that  the Purchaser will have  any
significant  assets  or liabilities  or engage  in  activities other  than those
incident to its formation and  capitalization and the transactions  contemplated
by  the  Offer. Because  the Purchaser  is  a newly  formed corporation  and has
minimal assets and capitalization, no meaningful financial information regarding
the Purchaser is available.
 
    Varlen is  subject to  the  information and  reporting requirements  of  the
Exchange  Act and  in accordance therewith  is obligated to  file reports, proxy
statements and other information with  the Commission relating to its  business,
financial  condition  and other  matters. Information,  as of  particular dates,
concerning Varlen's business, principal physical properties, capital  structure,
material  pending  legal  proceedings, operating  results,  financial condition,
directors and executive officers, their  remuneration, stock options granted  to
them,  the principal holders of Varlen's securities and any material interest of
such persons in  transactions with Varlen  and other matters  is required to  be
disclosed  in  proxy  statements  and  annual  reports  distributed  to Varlen's
stockholders and filed with the  Commission. Such reports, proxy statements  and
other information may be examined, and copies
 
                                       13

may  be obtained from the  Commission in the same manner  set forth in Section 8
with respect to information concerning the Company. Such information should also
be available for  inspection at  the offices of  the NASDAQ  Operations, 1735  K
Street, N.W., Washington, D.C. 20006.
 
    Set  forth below is  a summary of certain  selected financial information of
Varlen and its subsidiaries for the fiscal years ended January 31, 1996, January
31, 1995 and January 31, 1994 and for the three-month periods ended May 4,  1996
and  April  29, 1995,  which  has been  excerpted  or derived  from  the audited
consolidated financial statements  contained in Varlen's  Annual Report on  Form
10-K  for the fiscal years ended January 31,  1996 and January 31, 1995 and from
unaudited financial information contained in  the Company's Quarterly Report  on
Form  10-Q  for the  quarter  ended May  4,  1996. More  comprehensive financial
information is included in such reports and other documents filed by Varlen with
the Commission,  and the  following  summary is  qualified  in its  entirety  by
reference to such document and all of the financial statements and related notes
contained therein.
 
                               VARLEN CORPORATION
                         SELECTED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 


                                                     THREE MONTHS ENDED
                                                  ------------------------      FISCAL YEAR ENDED JANUARY 31,
                                                                APRIL 29,   -------------------------------------
                                                  MAY, 4 1996     1995         1996         1995         1994
                                                  -----------  -----------  -----------  -----------  -----------
                                                        (UNAUDITED)
                                                                                       
INCOME STATEMENT DATA:
  Net sales.....................................  $    91,975  $   106,969  $   386,987  $   341,521  $   291,908
  Cost of sales.................................       68,178       79,611      290,052      260,469      221,988
  Selling, general and administrative
   expenses.....................................       14,254       15,289       57,762       50,436       45,087
  Interest expense, net.........................        1,053        1,173        4,467        4,762        6,110
  Income before income taxes....................        8,490       10,896       34,706       25,854       18,723
  Net earnings..................................        4,822        6,156       19,609       14,762       10,766
  Earnings per share*:
    Primary earnings per share..................          .79         1.01         3.19         2.44         1.80
    Fully diluted earnings per share............          .60          .75         2.43         1.92         1.57
  Average shares outstanding*:
    Primary.....................................        6,095        6,101        6,141        6,064        5,986
    Fully diluted...............................        9,159        9,166        9,199        9,136        8,062
BALANCE SHEET DATA:
  Current assets................................  $   112,008  $   119,118  $   111,514  $   111,535  $    84,575
  Total assets..................................      234,123      232,214      230,874      220,186      186,264
  Current liabilities...........................       44,201       57,734       44,470       53,822       35,529
  Long-term debt................................       73,403       72,790       73,398       72,788       72,698
  Shareholders' equity..........................      101,399       86,766       97,953       79,031       63,644

 
- ------------------------
*Amounts  prior  to May  4, 1996  have been  restated for  a 10%  stock dividend
 declared on May 29, 1996 and payable on July 15, 1996.
 
    10.  BACKGROUND OF THE  OFFER.  On December  11, 1995, at Varlen's  request,
two  senior officers of Varlen, Richard L. Wellek, President and Chief Executive
Officer, and  Raymond A.  Jean,  Executive Vice  President and  Chief  Operating
Officer,  visited the Company's facilities in  Petersburg, Virginia and met with
Needham B. Whitfield, Chairman of the  Board of the Company and Chief  Executive
Officer,  J. Craig  Rice, President and  Chief Operating Officer,  and Howard J.
Bush, Vice  President --  Marketing. After  a presentation  by Mr.  Bush of  the
Company's markets and businesses, the Varlen executives were given a tour of the
manufacturing facilities, and afterwards a general discussion ensued. The Varlen
executives  pointed to a variety of changes in the railroad markets domestically
and internationally, and proposed that a large supplier, with a wide variety  of
products important to the
 
                                       14

rail   industry,  would  be  better  positioned  to  deal  with  these  changing
conditions. The Varlen executives asked the Company if they would be  interested
in  combining  with Varlen  to form  such a  supplier. The  Company's executives
agreed to think  about the  proposition, and  to have  further discussions  with
Varlen.
 
    On  January 25, 1996, Mr. Wellek,  together with George W. Hoffman, Railroad
Group Vice President for Varlen, returned to Petersburg and resumed  discussions
with  Messrs. Whitfield,  Rice, and Bush.  A number of  marketing synergies were
identified between the two  companies, and both parties  agreed to explore  each
other's operations in greater depth.
 
    On  February  20, 1996,  Messrs Whitfield,  Rice  and Bush  visited Keystone
Industries, Inc.  in Camp  Hill,  Pennsylvania. Keystone  is a  manufacturer  of
railroad  equipment components and a wholly  owned subsidiary of Varlen. After a
tour of  the  facilities,  further discussions  about  operations  and  railroad
markets were conducted with Messrs. Wellek and Hoffman.
 
    On  February 21, 1996, Messrs. Whitfield  and Rice accompanied Mr. Wellek to
Vassar, Michigan to tour two automotive parts plants of a Varlen subsidiary  and
meet  local  managers  of  these  operations.  Business  philosophies, marketing
strategies, organizational culture and operating methods were discussed.
 
    On March 11,  1996, Mr.  Wellek visited Messrs.  Whitfield and  Rice at  the
Company's administrative headquarters in Midlothian, Virginia to discuss whether
there  was  enough fit  between  the two  companies  to explore  in  earnest the
possibility of  a business  combination. The  two companies  agreed to  continue
discussions.
 
    On  March 20,  1996, Messrs.  Wellek and  Jean met  Mr. Rice  and Keith Poe,
Executive Vice  President  of Quality  Bearing  Service ("QBS"),  the  Company's
wholly  owned reconditioning subsidiary, in Little  Rock, Arkansas to tour QBS's
newest reconditioning plant and discuss the reconditioning operations.
 
    On March 21, 1996, Messrs. Wellek and Jean, who were in Louisville, Kentucky
for an annual truck  show, made a  brief tour of  QBS's reconditioning plant  in
Louisville.
 
    On  March  27,  1996, Varlen  signed  a confidentiality  agreement  with the
Company providing for the transfer  of confidential information to Varlen  about
the  Company's operations and financial results, and holding Varlen subject to a
standstill provision in  the event  Varlen wished  to use  this information  for
purposes of, among other things, making a public tender for the Company shares.
 
    On  April 3, 1996,  Richard A. Nunemaker, Vice  President, Finance and Chief
Financial Officer  of  Varlen,  met  with Jacob  M.  Feichtner,  Executive  Vice
President  and Chief Financial Officer of  the Company, Mr. Whitfield and others
to determine  what financial  and  operating data  was  available to  begin  his
inquiries.
 
    On  April 10, 1996,  Messrs. Wellek, Jean, Hoffman,  Thomas A. Robinson, and
others visited the Company's facilities in Petersburg to conduct an  engineering
review  of  the Company's  new  bearing developments  and  its development  of a
one-way clutch for the automotive market. Mr. Rice and several of the  Company's
engineers were involved in the discussions.
 
    On  April  11, 1996,  Messrs. Wellek,  Jean, Hoffman  and Robinson  met with
Messrs. Rice, Whitfield, and James W.  Benz, President of Rail Link, a  contract
switching subsidiary wholly owned by the Company. A variety of railroad industry
and international sales issues were discussed.
 
    On  April 15,  1996, Mr.  Nunemaker and  Stephen E.  Obendorf, met  with Mr.
Feichtner and others to further discuss and review financial and operating  data
of  the Company.  On the  same date, Vicki  L. Casmere,  Vice President, General
Counsel and Secretary of Varlen, met with the Company's counsel in Richmond  and
later  with Messrs. Feichtner  and Whitfield in Midlothian  to conduct a general
review of legal matters related to the Company's operations.
 
                                       15

    On May  7, 1996,  Mr. Wellek  met with  Messrs. Whitfield  and Rice  at  the
Company's Midlothian headquarters to review the status of Varlen's inquiries and
to  advise the Company's  executives that Varlen wished  to acquire the Company,
assuming the contract terms, timing and price were satisfactory to both parties.
There was a  general discussion as  to how  this process might  proceed and  Mr.
Wellek indicated the possible price range of a Varlen offer.
 
    On  May 29, 1996, Messrs. Whitfield and  Rice met with Messrs. Wellek, Jean,
Nunemaker, Robinson  and Ms.  Casmere at  Varlen's headquarters  in  Naperville,
Illinois.  Mr.  Whitfield  reported  the Company  Board's  response  to Varlen's
proposal and asked for definitive terms.
 
    On May  31, 1996,  Mr. Wellek  called Mr.  Whitfield and  informed him  that
Varlen  wished  to make  a cash  tender offer  for the  Shares and  assuming the
Company would cooperate by entering into an acquisition agreement, Varlen  would
submit a proposed draft of the agreement, which was done the following week. Mr.
Wellek  indicated that the final price offered  would depend on the terms of the
agreement.
 
    On June  11, 1996,  Mr. Wellek  and  Ms. Casmere  of Varlen,  together  with
Varlen's outside counsel, met with Messrs. Whitfield and Rice of the Company and
its  counsel and negotiated the basic terms  subject to approval of both boards.
Negotiations continued  over the  period  from June  11  to June  14  concerning
certain additional terms.
 
    At  the  June 13,  1996 Varlen  Board  of Directors'  meeting, the  Board of
Directors was updated on  the status of negotiations  relating to the Offer  and
the  proposed terms of the  relevant agreements. Mr. Bush  of the Company was in
attendance at the beginning of the meeting, made a presentation on the Company's
railroad bearing markets  and answered  questions by the  Varlen directors.  The
Board  of Directors then approved the  Acquisition Agreement and the Shareholder
Tender Agreement.
 
    The negotiations culminated  in the execution  of the Acquisition  Agreement
and  the Shareholder Tender  Agreement on Saturday,  June 15, 1996.  On June 17,
1996, Varlen  and the  Company, in  a joint  press release,  announced  Varlen's
intention to commence the Offer.
 
    11.    PURPOSE OF  THE  OFFER AND  THE MERGER;  PLANS  FOR THE  COMPANY; THE
ACQUISITION AGREEMENT AND SHAREHOLDER TENDER AGREEMENT.
 
    PURPOSE OF THE OFFER AND THE MERGER
 
    The purpose of  the Offer is  to facilitate  the acquisition of  all of  the
outstanding  Shares and thereby  to enable the Purchaser  to acquire control of,
and the entire equity interest in, the Company. The purpose of the Merger is  to
acquire  all outstanding Shares not tendered and purchased pursuant to the Offer
or acquired pursuant  to the Shareholder  Tender Agreement. The  Offer is  being
made pursuant to the Acquisition Agreement.
 
    No dissenter's rights are available in connection with the Offer. Holders of
Shares  may be entitled to dissenter's rights  in connection with the Merger if,
at the  record  date  with respect  to  the  meeting at  which  the  Acquisition
Agreement and the Merger will be acted upon, certain requirements are satisfied.
 
    Section  13.1-730  of the  Virginia  Act (as  effective  from July  1, 1996)
provides that no dissenter's rights are available for the shares of any class or
series of shares which, at the  record date fixed to determine the  shareholders
entitled  to receive notice of and to vote at the meeting of shareholders to act
upon the agreement  or plan  of merger,  were either  (i) listed  on a  national
securities  exchange  or  on  the  National  Association  of  Securities Dealers
Automated  Quotation  System  or  (ii)  held   of  record  by  at  least   2,000
shareholders, unless, among other things, in either case (i) the holders of such
class or series of shares are required by the terms of such agreement or plan to
accept  for such shares anything except cash or (ii) the transaction to be voted
on is an "affiliated transaction"  that has not been  approved by a majority  of
"disinterested directors." See Section 15.
 
    If the conditions of Section 13.1-730 of the Virginia Act are not met and if
the  Merger or  a similar  business combination  is consummated,  the holders of
Shares not purchased pursuant to the Offer
 
                                       16

would have certain rights to dissent and  demand to be paid the "fair value"  of
their  Shares  under  the  Virginia  Act.  Under  the  Virginia  Act, dissenting
shareholders who comply with applicable  statutory procedures would be  entitled
to  payment of the "fair value" of the Shares as to which dissenter's rights are
properly claimed  as of  the time  immediately before  the effectuation  of  the
Merger  (excluding  any  appreciation  or depreciation  in  anticipation  of the
Merger, unless such exclusion would be inequitable). In the first instance,  the
"fair  value" estimation is made by the corporation. Dissatisfied dissenters may
then notify  the  corporation of  their  own  "fair value"  estimation.  If  the
corporation  and the dissatisfied shareholder cannot  settle on the amount owed,
the shareholder will ultimately be entitled to a judicial determination of "fair
value." Any such judicial determination of the "fair value" of the Shares  could
be  based upon considerations other than or in addition to the price paid in the
Offer and the market value of the Shares, including asset values, the investment
value of the Shares and any other valuation considerations generally accepted in
the investment community. The "fair value" of the Shares so determined could  be
more  or less than the price per Share to  be paid pursuant to the Offer and the
Merger.
 
    THE FOREGOING  SUMMARY OF  THE RIGHTS  OF DISSENTING  SHAREHOLDERS DOES  NOT
PURPORT  TO BE  COMPLETE. THE  EXERCISE AND  PRESERVATION OF  DISSENTER'S RIGHTS
REQUIRE STRICT ADHERENCE TO THE APPLICABLE PROVISIONS OF THE VIRGINIA ACT.
 
    There can be no assurance that  the Merger will be consummated, inasmuch  as
the  Merger  is subject  to various  conditions,  some of  which are  beyond the
control of Varlen, the Purchaser and the  Company. See Section 13. In the  event
that, for any reason, the Merger does not occur, depending on the results of the
Offer, Varlen and the Purchaser intend to consider the desirability of acquiring
either additional Shares or the entire remaining equity interest in the Company.
If  Varlen  and/or  the  Purchaser  determine  to  do  either,  any  such future
transaction or  transactions might  be by  means of  a merger,  share  exchange,
reverse  stock split, open market or privately-negotiated purchases, one or more
additional tender offers, exchange offers or otherwise. Such transactions  might
involve  the exchange of Shares for cash, securities of the Company, Varlen, the
Purchaser or a subsidiary of any of  the foregoing, or some combination of  cash
and  securities, and may be  on terms and at prices  more or less favorable than
those  of  the  Offer.  Moreover,  the  decision  to  enter  into  such   future
transactions and the forms they might take will depend on the circumstances then
existing,  including the  financial resources  of Varlen  and the  Purchaser and
Varlen's business, tax and accounting  objectives, performance of the Shares  in
the  market, availability and alternative uses  of funds, money market and stock
market conditions, general economic conditions, and other factors. Varlen and/or
the Purchaser may enter into  one or more such  transactions whether or not  the
Purchaser  purchases Shares pursuant  to the Offer.  Varlen and/or the Purchaser
may also engage  in certain  of such  transactions during  the period  following
expiration of the Offer and prior to the Merger.
 
    PLANS FOR THE COMPANY
 
    As  described in this Offer to Purchase,  Varlen and the Purchaser have made
proposals which would, if completed, result in a merger of the Company,  changes
in its board of directors, the termination of quotations for the Company's stock
on  NASDAQ and the termination of the  registration of the Company's stock under
the Exchange Act. At present Varlen and the Purchaser do not have any plans  for
any material sale of the Company's assets, changes in capitalization or dividend
policy, or other changes in the Company's corporate structure or business. After
consummation  of the  Merger, Varlen  will continue  to review  the business and
operations of the Company and, based on such review, may effect the  acquisition
or  disposition of assets or other  changes in the Company's business, corporate
structure, capitalization,  management or  dividend  policy which  it  considers
appropriate  or desirable. Varlen has not  yet determined what specific actions,
if any, it may take with respect to the Company.
 
    THE ACQUISITION AGREEMENT
 
    THE OFFER AND  MERGER.  The  Acquisition Agreement provides  for the  public
announcement  of the Offer  within one business day  after the execution thereof
and for the commencement of the Offer as
 
                                       17

promptly as practicable, but  in no event later  than five business days,  after
such  public announcement. The  obligation and right of  Purchaser to accept for
payment and pay  for any Shares  tendered pursuant  to the Offer  is subject  to
satisfaction  of the  Minimum Condition,  the expiration  or termination  of all
waiting periods under the HSR Act and the other conditions described in  Section
13.  The Purchaser expressly reserves the right  to waive any such condition, to
increase the price per Share payable in the Offer and to make any other  changes
in the terms and conditions of the Offer; provided that the Purchaser has agreed
that  it will not (i)  decrease the price payable in  the Offer, (ii) change the
form of consideration  payable in the  Offer or the  Merger, (iii) increase  the
Minimum  Condition, or  (iv) amend  any other term  of the  Offer (including the
conditions described  in Section  13)  in a  manner  materially adverse  to  the
holders of Shares.
 
    The  Acquisition Agreement provides  that, as soon  as practicable following
consummation of the Offer and the satisfaction or waiver of certain  conditions,
the  Purchaser will be merged  into the Company, with  the Company surviving the
Merger. Pursuant to the Merger, each  outstanding Share (other than Shares  held
by  Varlen, the Purchaser, the  Company or any direct  or indirect subsidiary of
Varlen, the  Purchaser  or  the  Company,  and  Shares  with  respect  to  which
dissenter's  rights  under  the Virginia  Act  are properly  exercised)  will be
converted into  the right  to receive  $16.125 in  cash, without  any  interest.
Following  the Merger, the Company will be  a wholly owned subsidiary of Varlen.
The Merger  is subject  to  the satisfaction  of various  conditions,  including
approval by the Company's shareholders if required under the Virginia Act.
 
    In  the Acquisition Agreement the Company has represented and warranted that
its Board of  Directors has approved  the Offer and  the Merger and  recommended
acceptance of the Offer by holders of Shares and approval of the Merger (if such
approval  is required by the Virginia Act) by holders of Shares. The Company has
further represented and warranted that its Board of Directors (all of whom,  the
Company's counsel has opined to Varlen, are "disinterested directors" within the
meaning  of the Virginia Act with respect to Varlen and the Purchaser) has taken
certain actions  in order  to  exempt Varlen,  the Purchaser,  their  respective
direct  and  indirect  subsidiaries and  the  Offer,  the Merger  and  the other
transactions contemplated by the Acquisition Agreement from the restrictions and
other provisions of: (A)  Article 14 (AFFILIATED  TRANSACTIONS) of the  Virginia
Act,  in the manner  provided by Section 13.1-727.B.1(iv)  which (absent such an
exemption   or   similar    board   action)    generally   prohibits    mergers,
recapitalizations,  share exchanges, asset sales  and other transactions between
certain Virginia  corporations  and holders  of  10%  or more  of  their  voting
securities   ("interested  shareholders")  unless  approved  by  a  majority  of
"disinterested directors"  and/or holders  of  two-thirds of  the  corporation's
shares  excluding those of the interested shareholder; (B) Article 14.1 (CONTROL
SHARE ACQUISITIONS) of  the Virginia  Act, which  (absent such  an exemption  or
similar board action) generally denies voting rights to certain acquirers of 20%
of  more  of  the outstanding  voting  power  of a  public  Virginia corporation
("acquiring persons") unless  granted by a  majority of the  shares entitled  to
vote  in the election of  directors of the corporation  other than those held by
acquiring persons  and certain  corporate insiders;  and (C)  Article I  of  the
Articles  of Incorporation,  as amended  of the  Company (the  "Charter"), which
(absent such  an  exemption or  similar  board action)  generally  requires  the
affirmative  vote of holders of 75% of the  Shares in order to approve a merger,
consolidation and certain other business combinations between the Company and  a
beneficial  owner of  10% or more  of its Shares.  The Company and  its Board of
Directors have agreed to take such other actions necessary or appropriate at the
request of Varlen or the Purchaser  to: (1) exempt Varlen, the Purchaser,  their
respective direct and indirect subsidiaries, the Offer, the Merger and the other
transactions  contemplated by the  Acquisition Agreement from  the provisions of
any takeover,  affiliated  transactions,  business  combination,  control  share
acquisition  or other provision of (i) law  or regulation of the Commonwealth of
Virginia or any department or  agency thereof or (ii)  the Charter or Bylaws  of
the  Company,  and (2)  maintain the  shareholder vote  required to  approve the
Merger at the two-thirds level.
 
    COVENANTS OF THE COMPANY.  Under the Acquisition Agreement, the Company  has
agreed  that unless Varlen or the Purchaser otherwise agree in writing, prior to
the Effective Time or such earlier time as designees of the Purchaser constitute
a majority of the Board of Directors of the Company:
 
                                       18

        (i) the business of the Company and its subsidiaries shall be  conducted
    in  the ordinary course  of business and consistent  with past practice, and
    the Company shall use its reasonable  best efforts to maintain and  preserve
    its  and  its  subsidiaries' business  organization,  assets,  employees and
    advantageous business relationships;
 
        (ii) neither the Company nor any of its subsidiaries shall: (1) amend or
    propose to amend its articles of incorporation or bylaws; (2) split, combine
    or reclassify any shares of its capital  stock or declare, set aside or  pay
    any  dividend payable in cash, stock or property with respect to its capital
    stock except for regular quarterly cash dividends not in excess of $.07  per
    Share on the Shares and except for any dividend by a wholly owned subsidiary
    payable  to the Company or another wholly owned subsidiary; (3) issue, sell,
    pledge, dispose  of or  encumber  any additional  shares of,  or  securities
    convertible  into or exchangeable or  exercisable for, or options, warrants,
    calls, commitments or rights  of any kind to  acquire, any capital stock  of
    any  class of the Company or any of its subsidiaries other than Shares which
    the Company is required to issue pursuant to the options outstanding on June
    14, 1996; (4) transfer, lease,  license, sell, mortgage, pledge, dispose  of
    or  encumber any material assets  of the Company or  any of its subsidiaries
    other than  in the  ordinary course  of business  and consistent  with  past
    practice;  (5) redeem, purchase or  otherwise acquire directly or indirectly
    any of the  capital stock  or other equity  securities of  the Company;  (6)
    adopt  a plan of  liquidation or resolutions  providing for the liquidation,
    dissolution, merger, consolidation or other reorganization of the Company or
    any of its subsidiaries, except for mergers among wholly owned subsidiaries;
    (7) acquire (by merger, consolidation or acquisition of stock or assets) any
    corporation, partnership or other business organization or division  thereof
    or make any investment with respect thereto; (8) directly or indirectly: (i)
    incur  or modify any  long-term indebtedness or  short-term indebtedness for
    money borrowed or other material liability other than in the ordinary course
    of business and  consistent with  past practice, (ii)  incur any  additional
    indebtedness  for  money  borrowed  other than  in  the  ordinary  course of
    business and  consistent with  past practice,  or (iii)  make any  loans  or
    advances  other than in the ordinary  course of business and consistent with
    past practice and intercompany loans and advances among the Company and  its
    wholly  owned  subsidiaries;  (9)  pay,  discharge  or  satisfy  any claims,
    liabilities or  obligations (absolute,  accrued, contingent  or  otherwise),
    other  than the  payment, discharge  or satisfaction  of liabilities  in the
    ordinary course of business and  consistent with past practice; (10)  waive,
    release,  grant or transfer any  rights of value or  modify or change in any
    material respect any  existing license, lease,  contract or other  document,
    other  than  in the  ordinary course  of business  and consistent  with past
    practice; or (11) enter into  any material commitment or transaction,  other
    than in the ordinary course of business and consistent with past practice;
 
       (iii)  neither the Company  nor any of its  subsidiaries shall: (1) grant
    any increase in the compensation payable or to become payable by the Company
    or any of its  subsidiaries to any of  its directors, executive officers  or
    key  employees or adopt any new, or  amend or otherwise increase the amounts
    payable  or  to  become  payable  under,  any  existing,  bonus,   incentive
    compensation,   severance,  deferred  compensation,  profit  sharing,  stock
    option, stock  purchase, insurance,  pension, retirement  or other  employee
    benefit  plan (including (but not limited to) the granting of stock options,
    stock appreciation rights or restricted stock),  or (2) enter into or  amend
    any employment or change-in-control agreement with, or, except in accordance
    with  the existing written policies and agreements of the Company, grant any
    severance or termination pay  to, any director, officer  or employee of  the
    Company or any of its subsidiaries; and
 
       (iv)  neither the  Company nor  any of  its subsidiaries  shall agree, in
    writing or otherwise,  to take any  of the foregoing  actions or any  action
    which  would  make any  representation  or warranty  of  the Company  in the
    Acquisition Agreement untrue or incorrect in any material respect.
 
    NON-SOLICITATION.  The Acquisition  Agreement further provides that  neither
the  Company nor any of its subsidiaries, nor any of their respective directors,
officers,  employees,  investment  bankers,  representatives  or  agents  shall,
directly  or indirectly, make, solicit, initiate or encourage the initiation of,
any inquiries  or proposals  from, or  provide any  confidential information  or
participate  in any discussions or negotiations  with, or otherwise cooperate in
any way with  or assist,  any person (other  than Varlen  and its  subsidiaries,
those   third  parties  previously  disclosed  in  writing  by  the  Company  to
 
                                       19

Varlen  prior  to  the  execution  of  the  Acquisition  Agreement  ("Previously
Disclosed")  and  their  respective directors,  officers,  employees, investment
bankers, commercial banks,  representatives and agents)  concerning any  merger,
consolidation,  other  business  combination,  recapitalization,  liquidation or
dissolution or any purchase or other acquisition or sale or other disposition of
assets (other than  in the  ordinary course of  business) or  shares of  capital
stock  of the  Company or  any of  its subsidiaries  or any  similar transaction
involving the  Company or  (except as  Previously Disclosed)  any subsidiary  or
division  of  the Company  or any  subsidiary; PROVIDED,  HOWEVER, that  (i) the
Company or  its Board  of Directors  shall  not be  prohibited from  taking  and
disclosing  to the Company's shareholders a  position contemplated by Rule 14d-9
or Rule 14e-2 promulgated under the Exchange Act, and (ii) in the event that the
Company shall  receive an  unsolicited proposal  from a  third party  which  the
Company's  Board  of Directors  determines,  based on  the  advice of  its legal
counsel and  independent  financial advisor,  is  capable of  consummating  such
transaction, for the acquisition for cash of all the outstanding Shares on terms
that  the Company's Board  of Directors determines,  based on the  advice of its
financial advisor (the receipt of which advice shall be confirmed in writing  to
Varlen  by the Company), are economically superior to those of the Offer and the
Merger and which in  the written opinion  of legal counsel  to the Company  (the
delivery  of which shall  be confirmed in  writing to Varlen  by such counsel) a
failure to consider  by the Board  of Directors  of the Company  would create  a
substantial  risk  of  violating  their fiduciary  duties  to  shareholders, the
Company may provide information to such third party to the same extent that such
information has been  provided to  the Purchaser  and Varlen.  The Company  must
promptly  advise Varlen  of, and  communicate to Varlen  the terms  of, any such
inquiry or proposal the Company may receive.
 
    CONFIDENTIALITY AND STANDSTILL AGREEMENTS.  Under the Acquisition Agreement,
the Company has agreed to use its reasonable best efforts to obtain confidential
information, non-disclosure, non-use  and standstill agreements  from any  third
party  with or for  whom the Company or  any subsidiary has  taken any action or
received any proposal  not prohibited under  the non-solicitation provisions  of
the  Acquisition  Agreement.  The Company  also  agreed  not to  consent  to the
termination or  amendment of  the  confidential information,  non-disclosure  or
non-use provisions of any agreement with a third party without the prior written
consent  of Varlen or the  Purchaser, and to use  its reasonable best efforts to
take all actions  necessary or  proper to  enforce strict  compliance with  such
provisions.
 
    STOCK  INCENTIVE PLANS.   Under  the Acquisition  Agreement, the  Company is
required to  adjust the  terms  of all  outstanding  employee stock  options  to
purchase  Shares granted  under any  stock option  plan of  the Company  and all
restricted Shares granted under any restricted stock plan to cancel such options
and restricted Shares. Not later than immediately prior to the Merger, each such
option and restricted Share shall  become fully exercisable or unrestricted,  as
the  case may be, and vested. The Company  has agreed to use its reasonable best
efforts to cancel each  option outstanding not later  than immediately prior  to
the  Merger in exchange for a cash payment equal to the product of (i) the total
number of Shares subject to the option  and (ii) the excess, if any, of  $16.125
(or  any such  higher price  per Share  as may  be paid  in the  Offer) over the
exercise price per Share subject to such option. The Company has also agreed  to
use  its reasonable best efforts to cancel each restricted Share outstanding not
later than immediately prior to the Merger in exchange for $16.125. In addition,
the Board of Directors has agreed to take appropriate action with respect to the
Company's Employee Stock Savings Plan (the "Savings Plan") to provide that:  (i)
until  the earlier  to occur  of the  Effective Time  or any  termination of the
Acquisition Agreement, participants in the Savings Plan will not be eligible  to
receive  matching Shares on any Shares  purchased by such participants after the
date the  Acquisition Agreement,  and (ii)  any rights  of participants  in  the
Savings  Plan to receive matching Shares from the  Company as of the date of the
Acquisition Agreement accrued as a result of Shares purchased prior to the  date
of  the Acquisition Agreement shall be cancelled  in exchange for a payment, not
later than immediately prior to the Effective Time, from the Company (subject to
any applicable withholding taxes) in cash equal to the product of (x) the  total
number  of such accrued  matching Shares and (y)  $16.125. Under the Acquisition
Agreement, any  other plan  providing for  the issuance  or grant  of any  other
interest  in respect of the capital stock of the Company or any subsidiary shall
terminate as of the consummation of the Merger.
 
                                       20

    DESIGNATION OF DIRECTORS.  The Acquisition Agreement provides that, promptly
upon  the acceptance for payment  of and payment by  the Purchaser in accordance
with the  Offer  for  Shares  constituting  50%  or  more  of  all  Shares  then
outstanding  in accordance with the Offer, and from time to time thereafter, the
Purchaser will be entitled to designate such number of directors, rounded up  to
the next whole number, on the Board of Directors of the Company as will give the
Purchaser representation on the Board of Directors equal to at least that number
of  directors which equals the  product of the total  number of directors on the
Board of Directors multiplied  by the percentage that  such number of Shares  so
accepted  for payment and paid for or owned  by Varlen or the Purchaser bears to
the total number of  Shares outstanding; PROVIDED,  HOWEVER, that the  Purchaser
shall have the right (in its discretion) to designate a number of directors less
than such product; AND PROVIDED FURTHER, HOWEVER, that at all times prior to the
Merger  there shall  be at least  two members of  the Board of  Directors of the
Company selected by  current members  of such  Board. Subject  to the  preceding
sentence, upon the Purchaser's purchase of the Shares pursuant to the Offer, the
Purchaser  will  have sufficient  voting  power to  remove  the entire  Board of
Directors of the Company  and replace it with  the Purchaser's nominees. In  the
Acquisition  Agreement, the Company  has agreed to take  all action necessary to
cause the  Purchaser's  designees  to  be elected  to  the  Company's  Board  of
Directors  (including mailing  to the  shareholders the  information required by
Section 14(f) of the Exchange Act and Rule 14f-1 promulgated thereunder) and  to
use its reasonable best efforts to cause the resignation of such directors, and/
or  an increase in the number of its directors, as may be directed by Varlen and
required to implement the foregoing.
 
    CONFIDENTIALITY.  Under the Acquisition Agreement, Varlen and the  Purchaser
have   agreed  to,   and  to  cause   their  officers,   employees,  agents  and
representatives to, keep confidential, unless compelled to disclose by  judicial
or  administrative  process or  by other  requirements  of law,  all non-public,
confidential or proprietary information provided  by the Company (except to  the
extent  that such information can be shown  to have been (i) previously known by
Varlen or the Purchaser, (ii) in the public domain through no fault of Varlen or
the Purchaser, or (iii)  later lawfully acquired by  Varlen from other  sources)
and will not release or disclose such information to any other person.
 
    INDEMNIFICATION  AND INSURANCE.  The Acquisition Agreement provides that the
Charter or Bylaws of the Company, after the Merger (the "Surviving Corporation")
shall contain provisions no less favorable with respect to indemnification  than
those  that are set forth in the Company's Charter and Bylaws, as amended to the
date the Acquisition Agreement, which provisions may not be amended, repealed or
otherwise modified for a period  of five years after  the Effective Time in  any
manner  that would adversely affect the  rights thereunder of individuals who on
or prior to the Effective Time were directors, officers, employees or agents  of
the  Company  (the  "Indemnified  Parties"). Varlen  shall  cause  the Surviving
Corporation to fulfill such indemnification  obligations. Varlen also agreed  to
use  its reasonable best efforts  to cause to be  maintained in effect for three
years from the Effective Time the current policy (or successor policies) of  the
directors'  and  officers' liability  insurance maintained  by the  Company with
respect to  matters  occurring  prior  to the  Effective  Time,  to  the  extent
available; PROVIDED, HOWEVER, that Varlen is not required to expend more than an
amount  per year equal to 150% of current annual premiums paid by the Company to
maintain or procure insurance coverage pursuant hereto.
 
    REPRESENTATIONS AND WARRANTIES.  The Acquisition Agreement contains  various
customary  representations  and  warranties of  the  parties  thereto, including
representations by  Varlen  and  the  Purchaser as  to  their  organization  and
qualification,  authority  relative  to the  Acquisition  Agreement, compliance,
financing, and brokers and  finders, and by the  Company as to its  organization
and qualification, capitalization, capitalization of its subsidiaries, authority
relative  to the Acquisition Agreement, lack of conflicts, filing of reports and
financial statements,  litigation, employee  benefit  plans, taxes,  absence  of
certain changes, brokers and finders, liabilities, contracts, board actions, and
cash and cash equivalents.
 
    TERMINATION.   The Acquisition Agreement may be terminated at any time prior
to the Effective Time, whether prior to or after approval by the shareholders of
the Company:
 
                                       21

        (A) by mutual written consent of  the Boards of Directors of Varlen  and
    the Company;
 
        (B)  by  either  the  Company  or  Varlen  if  any  court  of  competent
    jurisdiction or other governmental body  shall have issued an order,  decree
    or  ruling or taken any  other action (which order,  decree, ruling or other
    action the parties hereto shall use their reasonable best efforts to  lift),
    in  each case,  permanently restraining, enjoining  or otherwise prohibiting
    the Offer or the Merger and such order, decree, ruling or other action shall
    have become final and non-appealable;
 
        (C) by the  Company, if  the Offer shall  have been  terminated, or  the
    Offer  shall have  expired, without  the purchase  of any  Shares thereunder
    within two business days thereof and  such non-purchase shall not have  been
    due  to a failure to satisfy any of the conditions of the Offer described in
    Section 13 of  this Offer  to Purchase; PROVIDED  that the  Company may  not
    terminate  the Acquisition  Agreement if  the Company  is in  breach of such
    agreement;
 
        (D) by the Company, if the Effective Time shall not have occurred on  or
    before  December 31, 1996 due  to a failure of any  of the conditions to the
    obligations of  the  Company  to  effect the  Merger  as  described  in  the
    Acquisition  Agreement;  PROVIDED that  the  Company may  not  terminate the
    Agreement if  the Company's  failure  to fulfill  any obligation  under  the
    Acquisition  Agreement has been the cause of, or resulted in, in whole or in
    part, the failure of the Effective Time to occur on or before such date;
 
        (E) by the Company, if: (1) any corporation, partnership, person,  other
    entity  or group (as defined in Section  13(d)(3) of the Exchange Act) other
    than Varlen or  the Purchaser  or any  of their  respective subsidiaries  or
    affiliates  (a "Qualified Person") shall  have commenced (within the meaning
    of Rule 14d-2 under the  Exchange Act) a cash tender  offer for any and  all
    Shares at a price at or in excess of $16.125 per Share, or (2) any Qualified
    Person  shall have made a  bona fide written proposal  involving a merger or
    consolidation of the Company or the acquisition of all the Shares or all  or
    a   substantial  portion  of  its  assets  which  would  result  in  a  cash
    distribution to shareholders of the Company  in excess of $16.125 per  Share
    (any  such proposal described in subclause (1) or (2) being referred to as a
    "Qualified Proposal"), and the Board of Directors of the Company shall  have
    been advised in a writing by its legal counsel (the delivery of which advice
    shall  have been confirmed in writing to  Varlen by such counsel) that there
    would be  a substantial  risk of  liability for  breach of  their  fiduciary
    obligations to shareholders if they failed to recommend such offer or accept
    such  Qualified  Proposal;  PROVIDED,  HOWEVER,  that  the  Company  may not
    terminate the  Acquisition  Agreement:  (i) until  the  expiration  of  five
    business  days after notice of such Qualified Proposal has been delivered to
    Varlen, or (ii) unless otherwise consented  to in writing by Varlen, if  any
    such  offer or Qualified Proposal is made in  breach of, or as a result of a
    breach of its non-solicitation obligation described herein;
 
        (F) by either of Varlen or the Purchaser, if due to a failure to satisfy
    any of the conditions of the Offer described in Section 13 of this Offer  to
    Purchase: (i) Varlen or any of its subsidiaries or affiliates shall not have
    commenced  the Offer, or shall have terminated  the Offer, or (ii) the Offer
    shall have expired without the purchase of any Shares thereunder within  two
    business  days thereof, or (iii) Varlen shall have determined not to proceed
    with the  Merger;  PROVIDED  that  neither  Varlen  nor  the  Purchaser  may
    terminate  the Acquisition Agreement if either Varlen or the Purchaser is in
    material breach of such agreement;
 
        (G) by either of  Varlen or the Purchaser,  if the Effective Time  shall
    not  have occurred on or before December 31, 1996 due to a failure of any of
    the conditions to the obligations of Varlen and the Purchaser to effect  the
    Merger  described in the Acquisition Agreement; PROVIDED that neither Varlen
    nor the Purchaser may terminate the Acquisition Agreement if Varlen's or the
    Purchaser's failure to fulfill any material obligation under the Acquisition
    Agreement has been the cause  of, or resulted in, in  whole or in part,  the
    failure of the Effective Time to occur on or before such date; or
 
       (H)  by either of  Varlen or the  Purchaser, if prior  to the purchase of
    Shares in the Offer, the Board of  Directors of the Company shall have:  (1)
    withdrawn, or modified in a manner adverse to
 
                                       22

    Varlen  or the Purchaser, its approval or recommendation of the Offer or the
    Merger or any of its other  actions taken in accordance with the  provisions
    of  the  Acquisition Agreement  summarized in  the  third paragraph  of "The
    Acquisition Agreement -- The Offer and Merger" hereinabove, (2) taken any of
    the actions referred to in the third paragraph of "The Acquisition Agreement
    -- The Offer and  Merger" hereinabove for the  benefit of any person  (other
    than  Varlen, the Purchaser or any  of their respective subsidiaries) or any
    transaction (other than the Offer and Merger), or (3) resolved to do any  of
    the foregoing.
 
    TERMINATION  FEE.  If the Acquisition Agreement is terminated by the Company
pursuant to the provision described in clause (E) of  "The Acquisition Agreement
- -- Termination"  above or  if  the Acquisition  Agreement  and/or the  Offer  is
terminated by Varlen or the Purchaser by reason of a failure of any condition to
the  Offer described  in (i) paragraphs  (a), (b) or  (g) of Section  13 of this
Offer to Purchase, (ii) paragraph  (c) of Section 13  of this Offer to  Purchase
(but  only if due,  in whole or  in part, to any  (x) act of  the Company or any
affiliate thereof,  or (y)  other occurrence,  event, fact  or circumstance  not
beyond  the control of  the Company or  any affiliate thereof),  or (iii) clause
(vi) of paragraph (c) of Section 13  of this Offer to Purchase, the Company  has
agreed  to  pay  to  Varlen  a termination  fee  of  $6,500,000  plus  an amount
sufficient to reimburse  Varlen and  its subsidiaries  for all  fees, costs  and
expenses relating to the transactions contemplated by the Acquisition Agreement,
the  financing contemplated  by the  Acquisition Agreement  and the transactions
contemplated thereby  (PROVIDED  that the  Company  shall not  be  obligated  to
reimburse  Varlen or  its subsidiaries  for more  than $2,000,000  of such fees,
costs and expenses).
 
    In the event of the termination of the Acquisition Agreement, it will become
null and void and have no effect without any liability on the part of any party,
except that provisions relating to the termination fee, expenses of the  parties
and  confidentiality  of  information  will  survive  any  such  termination and
provided that a party will not be relieved from liability for any breach of  the
Acquisition Agreement.
 
    COSTS  AND  EXPENSES.   The Acquisition  Agreement  provides that  except as
provided above  under "Termination  Fee,"  all costs  and expenses  incurred  in
connection with the transactions contemplated by the Acquisition Agreement shall
be paid by the party incurring such costs and expenses.
 
    SHAREHOLDER TENDER AGREEMENT
 
    TENDER   OF  TENDERING  SHAREHOLDER  SHARES.     Varlen  and  the  Tendering
Shareholders have entered into the Shareholder Tender Agreement, which  provides
that  each Tendering  Shareholder will tender  its Shares pursuant  to the Offer
before the Expiration Date and will not withdraw any Shares so tendered  without
Varlen's   prior  written  consent;  PROVIDED,   HOWEVER,  that  each  Tendering
Shareholder may: (i) refrain from so tendering its Shares, and may withdraw  any
Shares  previously so  tendered, if  and for  so long  as there  shall have been
commenced and not terminated a cash tender offer by any person or "group" (other
than Varlen  or  the  Purchaser  or any  of  their  respective  subsidiaries  or
affiliates)  for any and all Shares at a price in excess of $16.125 per share (a
"Superior Offer"); and (ii) tender its  Shares pursuant to such Superior  Offer;
AND  PROVIDED FURTHER,  HOWEVER, that  in the event  that (x)  any such Superior
Offer shall have expired or been  terminated without purchase of such  Tendering
Shareholder's  Shares, and  (y) the  Offer shall  then be  in effect,  then such
Tendering Shareholder shall again be subject to the foregoing provisions.
 
    Notwithstanding the foregoing, the  Shareholder Tender Agreement permits  up
to  50,000  of  the Tendering  Shareholders'  Shares  (in the  aggregate)  to be
contributed to one or more charitable organizations and, if and to the extent so
contributed, such Shares  will not be  required to be  tendered pursuant to  the
Offer.
 
    OTHER  AGREEMENTS.  During the term of the Shareholder Tender Agreement, and
except as  otherwise provided  therein  or with  the  prior written  consent  of
Varlen, each Tendering Shareholder may not (i) sell, pledge or otherwise dispose
of  any of its Shares, (ii) deposit its Shares into a voting trust or enter into
a voting agreement or arrangement with  respect to such Shares, (iii) grant  any
proxy,
 
                                       23

power-of-attorney  or other authorization in or  with respect to such Shares, or
(iv) enter into any  contract, option or other  arrangement or undertaking  with
respect   to  the  direct  or  indirect  sale,  assignment,  transfer  or  other
disposition of such Shares.
 
    The Shareholder  Tender Agreement  requires  each Tendering  Shareholder  to
abide  by  the  terms  of the  non-solicitation  provisions  of  the Acquisition
Agreement summarized in "The Acquisition Agreement -- Non-Solicitation"  section
set forth above in this Section 11.
 
    TERMINATION.    The Shareholder  Tender  Agreement will  terminate  upon the
earlier to occur of: (i) the termination of the Acquisition Agreement (if  any),
and (ii) the Effective Date.
 
    GENERAL.   The  preceding descriptions  of the  terms and  provisions of the
Acquisition Agreement  and the  Shareholder Tender  Agreement are  qualified  in
their  entirety by reference to the texts of such agreements, which are exhibits
to the  Tender Offer  Statement on  Schedule 14D-1  filed by  the Purchaser  and
Varlen  with the Commission and  is available for inspection  and copying at the
principal office of the Commission in the manner set forth in Section 9.
 
    12.  SOURCE AND AMOUNT OF FUNDS.  The total amount of funds required by  the
Purchaser to purchase all presently outstanding Shares pursuant to the Offer and
the Merger and to pay related fees and expenses is estimated to be approximately
$165 million. Such funds will be obtained by the Purchaser or provided by Varlen
or  one or more of its subsidiaries to the Purchaser from available cash on hand
and pursuant to  a $190 million  credit facility (the  "Credit Facility") to  be
provided  by The  First National  Bank of Chicago  (the "Agent  Bank") and other
banks and financial institutions who may become party thereto (collectively with
the Agent Bank, the "Banks"), the identity of which has not yet been determined.
The Credit Facility will be comprised of a term loan commitment (the "Facility A
Commitment") in the aggregate principal amount of approximately $135 million  to
be  provided to the Purchaser, and  a revolving credit/letter of credit facility
(the "Facility B Commitment") in the aggregate principal amount of approximately
$55 million to  be provided  to Varlen, the  Purchaser and/or  any other  wholly
owned  subsidiary  of  Varlen  who  may satisfy  the  conditions  to  becoming a
"Borrowing Subsidiary"  under  the  applicable  credit  agreement  (Varlen,  the
Purchaser and each such other subsidiary, in such capacity, the "Borrowers").
 
    The Facility A Commitment and the revolving credit portion of the Facility B
Commitment  will bear interest, at the Borrower's option from time to time, at a
rate equal to either the "Alternate  Base Rate," the "Eurocurrency Rate" or  the
"Fixed  CD Rate," in each case plus  a spread based on Varlen's Leverage Ratio."
The "Alternate Base Rate" for any day will  mean the greater of (i) the rate  of
interest  announced by the Agent Bank as  its "Corporate Base Rate" for such day
or (ii) the "Federal Funds Effective Rate"  in effect on such day plus .50%  per
annum,  changing as and when such Corporate Base Rate or Federal Funds Effective
Rate changes.  "Eurocurrency  Rate" generally  will  mean the  rate  for  dollar
deposits  appearing on  Telerate Page  3750, as  adjusted for  maximum statutory
reserves. The "Fixed  CD Rate" generally  will mean the  rate determined by  the
Agent  Bank based on  the average of  the prevailing bid  rates on the borrowing
date for the purchase of certificates of deposit of the Agent Bank, adjusted for
maximum Federal  Reserve  Board reserve  requirements  and the  Federal  Deposit
Insurance  Corporation  assessment rate.  The Credit  Facility will  provide for
customary provisions  relating to  yield  protection, availability  and  capital
adequacy.
 
    The  Credit Facility will provide for the  payment by Varlen of certain fees
including a (i) commitment fee at a  rate ranging from .175% to .375% per  annum
based  on the average daily unused portion  of the Facility A Commitment and the
Facility B Commitment and (ii) certain  letter of credit fees ranging from  .50%
to  1.25% per annum based on the undrawn stated amount of each letter of credit,
a letter of  credit fronting fee  of 0.15% of  the face amount  of each  standby
letter  of credit  and customary fees  in connection with  commercial letters of
credit and performance letters of credit.
 
    The  Credit   Facility  will   have  customary   conditions  to   borrowing,
representations  and  warranties,  covenants  and  events  of  default.  Without
limiting the generality of the foregoing,  the Lenders obligation to fund  shall
be conditioned upon the satisfaction of the Minimum Condition.
 
                                       24

    Each  of Varlen and its domestic  subsidiaries (including the Purchaser and,
upon consummation of the Offer or the Merger, the Company) will  unconditionally
guarantee  the indebtedness, obligations and  liabilities of the Borrowers under
the Credit Facility.
 
    The commitment of  the Banks under  the Credit Facility  will expire on  the
sixth  anniversary of the date of the closing of the Credit Facility, subject to
certain extension provisions. It is anticipated that borrowings under the Credit
Facility will  be repaid  from  funds generated  internally  by Varlen  and  its
subsidiaries  (including the Company) and from  other sources, which may include
other bank financings.
 
    THE OFFER IS NOT SUBJECT TO A FINANCING CONDITION.
 
    13.  CERTAIN CONDITIONS  OF THE OFFER AND  THE MERGER.  Notwithstanding  any
other  provision  of  the Acquisition  Agreement  or  the Offer,  and  except as
expressly limited below,  the Purchaser: shall  not be required  to commence  or
continue  the  Offer; or  accept for  payment,  purchase or  pay for  any Shares
tendered; may  postpone the  acceptance  for payment,  the purchase  of,  and/or
payment for, Shares; and/ or may amend (subject to the restrictions contained in
the  Acquisition Agreement, which for  purposes of this section  of the Offer to
Purchase includes the same as it  may be modified, amended, supplemented  and/or
restated from time to time) or terminate the Offer; if: (1) there shall not have
been  validly tendered and not withdrawn prior  to the expiration of the Offer a
number of  Shares which,  together with  the Shares  beneficially owned  by  the
Purchaser  and Varlen,  represents two-thirds of  the total voting  power of all
shares of capital stock of the Company outstanding on a fully-diluted basis,  or
(2)  any waiting  period under  the HSR  Act applicable  to the  purchase of the
Shares pursuant to the Offer shall not  have expired or been terminated, or  (3)
at  any time on or after  June 1, 1996 and prior to  the time of payment for any
such Shares  (whether or  not  any Shares  have  theretofore been  accepted  for
payment or paid for pursuant to the Offer), any of the following events (each an
"Event")  shall have  occurred (each of  paragraphs (a) through  (h) providing a
separate and independent  condition to the  Purchaser's obligations pursuant  to
the Offer):
 
       (a) the  Company shall have authorized, recommended or proposed, or shall
           have announced an  intention to authorize,  recommend or propose,  or
    shall  have entered into an agreement or agreement in principle with respect
    to, any merger, consolidation, other business combination, recapitalization,
    liquidation or dissolution, or any purchase or other acquisition or sale  or
    other  disposition of assets (other than in the ordinary course of business)
    or shares of capital stock of the Company or any of its subsidiaries, or any
    similar transaction involving the Company  or any subsidiary or division  of
    the  Company  or any  subsidiary (other  than the  Merger and  as Previously
    Disclosed  with  respect  to  certain  subsidiaries)  (the  foregoing  being
    collectively  referred  to as  a  "Business Combination"),  or  any material
    change in  its  capitalization, or  any  release or  relinquishment  of  any
    material contract or other rights not in the ordinary course of business; or
 
       (b) (i)  the Board of Directors of the Company shall have (x) modified or
           amended in any respect its recommendation of the Offer, the Merger or
    any of its  other actions  taken in accordance  with the  provisions of  the
    Acquisition  Agreement summarized in the third paragraph of "The Acquisition
    Agreement -- The Offer and Merger" in Section 11 of this Offer to  Purchase,
    or  (y) adopted  any resolution to  do so,  or (ii) the  opinion of Virginia
    counsel to the Company received by  the Company pursuant to the  Acquisition
    Agreement (which opinion relates to the actions of the Board of Directors of
    the  Company  described  in  the  foregoing  clause  (i))  shall  have  been
    disclaimed, disavowed,  retracted  or  revoked  in  any  respect,  or  shall
    otherwise  have been rendered inaccurate or erroneous, or (iii) the Board of
    Directors of the Company shall  have (x) taken any  of the actions taken  in
    accordance  with the provisions  of the Acquisition  Agreement summarized in
    the third paragraph of "The Acquisition  Agreement -- The Offer and  Merger"
    in  Section 11  of this  Offer to  Purchase for  the benefit  of any person,
    entity or group (as defined in Section 13(d)(3) of the Exchange Act)  (other
    than  Varlen, the Purchaser or any  of their respective subsidiaries) or any
    Business Combination (other than the Offer  and the Merger), or (y)  adopted
    any resolution to do so; or
 
                                       25

       (c) it  shall have been  publicly disclosed, or  Varlen, the Purchaser or
           the  Company  shall  have  learned  that:  (i)  any  person,   entity
    (including  the Company or  any of its subsidiaries  or affiliates) or group
    (as defined in Section 13(d)(3) of the Exchange Act) (a "Person") shall have
    (x) acquired  or  become  the beneficial  owner  of  more than  10%  of  the
    outstanding  Shares  (other than  the Tendering  Shareholders), or  (y) been
    granted by  the  Company  any  warrant,  option  or  right,  conditional  or
    otherwise,  to  acquire  beneficial  ownership  of  more  than  10%  of  the
    outstanding Shares, other  than acquisitions  by a Person  who has  publicly
    disclosed  such ownership in a Schedule 13D or 13G (or amendment thereto) on
    file with the Commission prior to June 1, 1996, and other than for bona fide
    arbitrage purposes, or (ii) any such Person (other than, in the case of  the
    following clause (x), a Tendering Shareholder) who has publicly disclosed in
    such  a Schedule  13D or  13G any  such ownership  of more  than 10%  of the
    outstanding Shares prior to such date shall have (x) acquired or become  the
    beneficial  owner of, or proposed to  acquire or become the beneficial owner
    of, additional  Shares, or  (y) been  granted by  the Company  any  warrant,
    option  or right, conditional or otherwise,  to acquire any Shares, or (iii)
    any new group shall have been  formed which beneficially owns more than  10%
    of the Shares, or (iv) any Person shall have commenced, or publicly proposed
    to commence, a tender offer for outstanding Shares, or publicly proposed any
    Business   Combination,  or  (v)   any  Person  shall   have  commenced  any
    solicitation of proxies  with respect  to the  Shares in  opposition to  the
    Merger,  or (vi)  any Person  shall have  acquired or  become the beneficial
    owner of more than 50% of the outstanding Shares; or
 
       (d) there shall be  pending any  action or proceeding  before any  court,
           government,  governmental  authority  or agency:  (i)  challenging or
    seeking to make illegal, or to delay or otherwise directly or indirectly  to
    restrain or prohibit the making of the Offer, the acceptance for payment of,
    payment  for, or the purchase  of, some or all of  the Shares by Varlen, the
    Purchaser or any other subsidiary or affiliate of Varlen or the consummation
    of the Merger, or seeking to obtain material damages in connection with  the
    Offer  or the Merger, or (ii) seeking  to prohibit ownership or operation by
    Varlen, the Purchaser or any other subsidiary or affiliate of Varlen of  all
    or  a material portion of  the business or assets  of Varlen, the Company or
    any of their respective subsidiaries or affiliates or to compel Varlen,  the
    Purchaser or any other subsidiary or affiilate of Varlen to dispose of or to
    hold  separately all  or a  material portion  of the  business or  assets of
    Varlen, the Company or any  of their respective subsidiaries or  affiliates,
    as  a result  of the  Offer or  the Merger,  or (iii)  seeking to  impose or
    confirm limitations on the  ability of Varlen, the  Purchaser, or any  other
    subsidiary  or affiliate  of Varlen effectively  to exercise  full rights of
    ownership and control of any Shares (or  any shares of capital stock of  any
    subsidiary of the Company) (including, without limitation, the right to vote
    any  such Shares (or shares of a subsidiary)) acquired pursuant to the Offer
    or otherwise (directly or indirectly), on all matters properly presented  to
    the  Company's shareholders (or any such subsidiary's shareholders), or (iv)
    seeking to  require  divestiture  by  Varlen, the  Purchaser  or  any  other
    subsidiary  or affiliate  of Varlen  of any  Shares, or  (v) invalidating or
    rendering unenforceable any material provision of the Acquisition Agreement,
    or (vi)  which  otherwise  might materially  adversely  affect  Varlen,  the
    Company or any of their respective subsidiaries or affiliates;
 
       (e) there  shall be any  action taken, or  any statute, rule, regulation,
           judgment, order or injunction  proposed, enacted, entered,  enforced,
    promulgated,  issued or deemed applicable to the Offer or the Merger, by any
    court,  government,  governmental  authority  or  agency  (other  than   the
    application  of the waiting period provisions of the HSR Act to the Offer or
    to the  Merger) which  may, directly  or indirectly,  result in  any of  the
    consequences referred to in paragraph (d) above;
 
       (f) there  shall  have  occurred:  (i)  any  general  suspension  of,  or
           limitation on  prices  for, trading  in  securities on  any  national
    securities exchange or in the over-the-counter market, or (ii) a declaration
    of a banking moratorium or any suspension of payments in respect of banks in
    the United States, or (iii) any limitation (whether or not mandatory) by any
    governmental authority on, or any other event which, in the sole judgment of
    Varlen,  might  affect the  extension of  credit by  banks or  other lending
    institutions in  the United  States,  or (iv)  any  material change  in  the
 
                                       26

    United  States or any other currency exchange  rates or any suspension of or
    limitation on, the markets therefor, or (v) any extraordinary adverse change
    in the financial  markets or the  market price  of the Shares,  or (vi)  any
    change in the general political, market, economic or financial conditions in
    the United States or abroad that could, in the sole judgment of Varlen, have
    a  material adverse effect upon the business or operations of the Company or
    any of its subsidiaries or affiliates or the trading of the Shares, or (vii)
    a commencement of war, armed hostilities or other international or  national
    calamity  directly or indirectly  involving the United  States, or (viii) in
    the case of any of the foregoing existing at the time of the commencement of
    the Offer, a material acceleration or worsening thereof; or
 
       (g) the representations and warranties of the Company in the  Acquisition
           Agreement  shall not be true and correct in all material respects, or
    the Company shall not have performed in all material respects each  covenant
    and  complied with each agreement  to be performed and  complied with by the
    Company under the Acquisition Agreement; or
 
       (h) the Company and Varlen  shall have agreed to  terminate the Offer  or
           the   Acquisition  Agreement,  or  the  Acquisition  Agreement  shall
    otherwise have been terminated in accordance with its terms;
 
which, in the sole judgment of the  Purchaser, in any such case, and  regardless
of  the circumstances  (including any  action or  inaction by  the Purchaser and
Varlen) giving rise to any such  condition, make it inadvisable to proceed  with
acceptance  for payment or purchase of or  payment for any Shares tendered or to
proceed with the Merger.
 
    The foregoing  conditions  are  for  the sole  benefit  of  Varlen  and  the
Purchaser  and may  be asserted  by Varlen and  the Purchaser  regardless of the
circumstances giving rise to such condition, including (without limitation)  any
action or inaction by Varlen or the Purchaser, or may be waived by Varlen or the
Purchaser  in whole  at any  time or  in part  from time  to time  in their sole
discretion. The failure by Varlen or the  Purchaser at any time to exercise  any
of  the foregoing rights shall not be deemed a waiver of any such right and each
such right shall be deemed an ongoing right and may be asserted at any time  and
from  time to time. Any determination by  Varlen or the Purchaser concerning any
Event shall be final and binding upon all parties.
 
    In addition, under the Acquisition  Agreement the obligations of Varlen  and
the  Purchaser to consummate and effect the  Merger are subject to the condition
that the Company shall not have received  demands for payment of the fair  value
of Shares (pursuant to Article 15 (DISSENTER'S RIGHTS) of the Virginia Act) with
respect to more than 5% of the outstanding Shares.
 
    In  addition, notwithstanding anything  to the contrary  in this Section 13,
the obligations of the Purchaser to accept for payment, purchase or pay for  any
Shares  tendered shall also be  subject to the expiration  or termination of all
waiting periods under the HSR Act that are applicable to the purchase of  Shares
pursuant to the Offer and the Acquisition Agreement.
 
    14.    DIVIDENDS AND  DISTRIBUTIONS.   If, on  or after  June 15,  1996, the
Company should  (i)  split,  combine  or otherwise  change  the  Shares  or  the
Company's  capitalization, (ii) issue  or sell any  additional securities of the
Company or otherwise cause an increase  in the number of outstanding  securities
of  the Company (except for Shares issuable  upon the exercise of employee stock
options outstanding on  the date  of the Acquisition  Agreement), (iii)  acquire
currently  outstanding Shares  or otherwise cause  a reduction in  the number of
outstanding Shares, or (iv)  disclose that it has  taken any such action,  then,
without  prejudice to Purchaser's rights under  Sections 1 and 13, the Purchaser
may, in its sole  discretion, make such adjustments  as it deems appropriate  to
reflect  such split, combination or  other change in the  purchase price and the
other terms  of the  Offer or  the Merger  (including, without  limitation,  the
number  and  type of  securities offered  to be  purchased, the  amounts payable
therefor and the fees payable hereunder).
 
    Except for  regular quarterly  cash dividends  paid by  the Company  on  its
Shares  in an amount not  in excess of $.07  per Share on the  Shares, if, on or
after June 15, 1996, the Company should declare or
 
                                       27

pay any cash or stock  dividend or other distribution  or issue any rights  with
respect  to the Shares, payable or distributable  to shareholders of record on a
date prior  to the  transfer to  the name  of the  Purchaser or  its nominee  or
transferee  on the Company's  stock transfer records of  the Shares accepted for
payment pursuant to the Offer, then, without prejudice to the Purchaser's rights
under Sections  1  and 13  and  without limiting  the  rights of  the  Purchaser
described  in the  preceding paragraph  of this  Section 14,  any such dividend,
distribution or  right to  be received  by the  tendering shareholders  will  be
received  and held by the tendering shareholder for the account of the Purchaser
and will be required to be  promptly remitted and transferred by each  tendering
shareholder  to  the Depositary  for the  account  of Purchaser,  accompanied by
appropriate documentation and transfer.  Pending such remittance, the  Purchaser
will  be entitled to  all rights and  privileges as owner  of any such dividend,
distribution or right and may withhold the entire purchase price or deduct  from
the  purchase price the amount or value  thereof, as determined by the Purchaser
in its sole discretion.
 
    15.  CERTAIN LEGAL MATTERS.  Except  as set forth in this Section 15,  based
on a review of publicly available filings by the Company with the Commission and
other  information concerning the  Company provided to  Varlen, the Purchaser is
not aware of any license or other regulatory permit which appears to be material
to the business  of the  Company and  that might  be adversely  affected by  the
Purchaser's  acquisition  of  Shares pursuant  to  the Offer  (and  the indirect
acquisition of the stock of the  Company's subsidiaries), or of any approval  or
other  action by any  domestic or foreign  governmental or administrative agency
that would  be required  prior to  the acquisition  of Shares  by the  Purchaser
pursuant  to the Offer. Should any such approval or other action be required, it
is the Purchaser's  present intention  that such additional  approval or  action
would  be sought.  While the  Purchaser does not  presently intend  to delay the
purchase of Shares tendered  pursuant to the Offer  pending receipt of any  such
additional  approval or the taking of any such action, there can be no assurance
that any  such additional  approval  or action,  if  needed, would  be  obtained
without  substantial conditions or that adverse consequences might not result to
the Company's or Varlen's  business, or that certain  parts of the Company's  or
Varlen's  business might not be  required to be disposed  of or held separate or
other substantial conditions complied with in  order to obtain such approval  or
action  or in the  event that such  approvals were not  obtained or such actions
were not taken.  The Purchaser's obligation  to purchase and  pay for Shares  is
subject  to certain conditions  relating to the legal  matters discussed in this
Section 15. See Section 13.
 
    ANTITRUST.  Under the HSR Act,  certain acquisition transactions may not  be
consummated  unless  certain information  has  been furnished  to  the Antitrust
Division of the Department of Justice (the "Antitrust Division") and the Federal
Trade Commission  ("FTC")  and certain  waiting  period requirements  have  been
satisfied.  The acquisition of Shares pursuant  to the Offer and the Acquisition
Agreement is subject to such requirements.  On June 20, 1996, Varlen filed  with
the  Antitrust Division and the FTC a  Notification and Report Form with respect
to the Offer and the Merger.
 
    Under the provisions of the HSR Act applicable to the Offer, the purchase of
Shares pursuant to the Offer may not be consummated prior to the expiration of a
15-calendar day waiting period  following the filing  by Varlen, unless  earlier
terminated.  Accordingly, as such filing was made  on June 20, 1996, the waiting
period which is applicable to the Offer will expire at 11:59 p.m., New York City
time, on July 5, 1996, unless Varlen  receives a request from either the FTC  or
the  Antitrust Division for  additional information or  documentary material, or
the Antitrust Division and the FTC  terminate the waiting period prior  thereto.
If,  within such 15-day waiting period either  the Antitrust Division or the FTC
requests additional information  or material from  Varlen concerning the  Offer,
the  waiting period will  be extended and  would expire at  11:59 p.m., New York
City time, on the tenth calendar day after the date of substantial compliance by
Varlen with such request. Only one extension of the waiting period pursuant to a
request for additional information is authorized by the rules promulgated  under
the  HSR Act.  Thereafter, the  waiting period could  be extended  only by court
order or  with the  consent  of the  Purchaser. The  additional  10-calendar-day
waiting period may be terminated sooner by the FTC or the Antitrust Division. In
practice,  complying with a  request for additional  information or material can
take a significant  amount of time.  In addition, if  the Antitrust Division  or
 
                                       28

the FTC raises substantive issues in connection with a proposed transaction, the
parties  frequently engage in negotiations with the relevant governmental agency
concerning possible means  of addressing  those issues  and may  agree to  delay
consummation  of the transaction while  such negotiations continue. Although the
Company is required to  file certain information  and documentary material  with
the  Antitrust Division and the FTC in connection with the Offer and the Merger,
neither the Company's failure  to make such  filings nor a  request made to  the
Company  from the  Antitrust Division or  the FTC for  additional information or
documentary material will extend the Offer  period with respect to the  purchase
of  Shares pursuant  to the Offer  and the Acquisition  Agreement. The Purchaser
will not accept  for payment Shares  tendered pursuant to  the Offer unless  and
until the waiting period requirements imposed by the HSR Act with respect to the
Offer have been satisfied. See Section 13.
 
    If  the acquisition of Shares is delayed pursuant to a request by the FTC or
the Antitrust  Division  for  additional  information  or  documentary  material
pursuant  to the HSR Act, the Offer may,  at the discretion of the Purchaser, be
extended and, in  any event,  the purchase  of and  payment for  Shares will  be
deferred  until ten  days after  the request  is substantially  complied with by
Varlen, unless the ten-day  extended period expires on  or before the date  when
the  initial waiting period  would otherwise have expired  or unless the waiting
period is sooner terminated by the  FTC and the Antitrust Division. See  Section
2.  Unless the Offer is  extended, any extension of  the waiting period will not
give rise to any additional withdrawal rights. See Section 3.
 
    The Antitrust Division and the FTC frequently scrutinize the legality  under
the  antitrust laws  of transactions  such as the  acquisition of  Shares by the
Purchaser pursuant to the Offer and the Merger. At any time before or after  the
Purchaser's  purchase of  Shares, the Antitrust  Division or the  FTC could take
such action under the antitrust laws  as either deems necessary or desirable  in
the public interest, including seeking to enjoin the purchase of Shares pursuant
to  the  Offer  and  the  Merger  or  seeking  divestiture  of  Shares purchased
thereunder or the divestiture of assets of the Company, the Purchaser, Varlen or
any of their respective subsidiaries or  affiliates. Private parties as well  as
state  attorneys general may  also bring legal actions  under the antitrust laws
under certain  circumstances. If  any  such action  by  the FTC,  the  Antitrust
Division  or any other person should  be instituted, the Purchaser could decline
to accept for payment any Shares tendered. See Section 13 for certain conditions
to the  Offer.  Based  upon  an  examination  of  information  relating  to  the
businesses in which Varlen and the Company are engaged, Varlen believes that the
consummation  of the Offer would not  violate any antitrust laws. However, there
can be no assurance that a challenge to the Offer on antitrust grounds will  not
be made or, if a challenge is made, what the result will be.
 
    The  Merger would not require an additional  filing under the HSR Act if the
Purchaser owns 50% or more of the  outstanding Shares at the time of the  Merger
or  if  the Merger  occurs  within one  year after  the  HSR Act  waiting period
applicable to the Offer expires or is terminated.
 
    STATE TAKEOVER LAWS
 
    The Company is  incorporated under the  laws of the  State of Virginia.  The
following  is a  summary of  certain provisions  of the  Virginia Act  which are
applicable to the Offer.
 
    SHAREHOLDER VOTE REQUIRED TO APPROVE FUNDAMENTAL ACTIONS.  Section  13.1-718
of  the Virginia Act provides that, except for certain parent-subsidiary mergers
(see "Introduction"  above),  certain  significant  corporate  actions  must  be
approved  by a vote of more than two-thirds  of the votes entitled to be cast on
the matter unless the corporation's  articles of incorporation specify a  higher
or  lower vote. These  matters include mergers  (with certain exceptions), share
exchanges, sales  of  all  or  substantially  all  of  a  corporation's  assets,
dissolutions  and  amendments  to  a  corporation's  articles  of  incorporation
("Fundamental Actions"). The Company's Charter currently provides that the  vote
required  to  approve  certain  Fundamental  Actions  constituting  a  "business
combination" (as defined therein) with a beneficial owner of 10% or more of  the
Shares  is 75% of  the Shares. See  "The Acquisition Agreement  -- The Offer and
Merger" in Section 11 above.
 
                                       29

    AFFILIATED TRANSACTIONS  STATUTE.   Article  14  of the  Virginia  Act  (the
"Affiliated  Transactions Statute") generally prohibits a publicly held Virginia
corporation from engaging  in an  "affiliated transaction"  with an  "interested
shareholder"  for a period of  three years after the  date of the transaction in
which the person  became an  interested shareholder,  unless (i)  a majority  of
disinterested  directors  approved  in  advance  the  transaction  in  which the
interested shareholder became an interested  shareholder or (ii) the  affiliated
transaction   is  approved  by  the  affirmative  vote  of  a  majority  of  the
disinterested directors and the holders of two-thirds of the voting shares other
than the shares beneficially owned by the interested shareholder. A  corporation
may engage in an affiliated transaction with an interested shareholder beginning
three  years after  the date of  the transaction  in which the  person became an
interested shareholder, if  the transaction  is approved  by a  majority of  the
disinterested directors or by two-thirds of the disinterested shareholders or if
it complies with certain statutory fair price provisions.
 
    Subject  to  certain  exceptions,  under  the  Virginia  Act  an "interested
shareholder"  is  a  person  who,  together  with  affiliates  and   associates,
beneficially   owns  10%  or  more   of  the  corporation's  outstanding  voting
securities. "Affiliated transactions" include (i)  any merger or share  exchange
with  an interested shareholder; (ii) the transfer to any interested shareholder
of  corporate  assets  with  a  fair  market  value  greater  than  5%  of   the
corporation's  consolidated  net worth;  (iii)  the issuance  to  any interested
shareholder of voting shares  with a fair  market value greater  than 5% of  the
fair  market value of all outstanding voting shares of the corporation; (iv) any
reclassification of securities  or corporate reorganization  that will have  the
effect  of  increasing  by  5%  or  more  the  percentage  of  the corporation's
outstanding voting shares held by any  interested shareholder; and (v) any  plan
or  proposal for dissolution of the corporation  proposed by or on behalf of any
interested shareholder.
 
    Under certain circumstances, the Affiliated Transactions Statute may make it
more difficult for an interested shareholder to effect various transactions with
the Company, after the consummation of the Merger. These provisions may have the
effect of preventing changes in management and possibly making it more difficult
to accomplish transactions which shareholders may otherwise deem to be in  their
best interests.
 
    CONTROL  SHARE ACQUISITIONS STATUTE.  Article  14.1 of the Virginia Act (the
"Control Share Acquisitions Statute")  provides that shares  of a publicly  held
Virginia  corporation  that  are  acquired  in  a  "control  share  acquisition"
generally will have no voting rights  unless such rights are conferred on  those
shares  by  the vote  of a  majority of  all the  outstanding shares  other than
interested  shares.  A  control  share  acquisition  is  defined,  with  certain
exceptions,  as the  acquisition of  the beneficial  ownership of  voting shares
which would cause the acquirer to have voting power within the following  ranges
or  to move upward from one range into another: (i) 20% to 33 1/3%; (ii) 33 1/3%
to 50%; or (iii) more than 50%, of such votes.
 
    The foregoing summary of the provisions of the Virginia Act does not purport
to be complete and is qualified in  its entirety by reference to the  provisions
of the Virginia Act.
 
    The  Board of Directors of the Company has approved the Offer and the Merger
and recommended acceptance of  the Offer by holders  of Shares and approval  (if
required  by the Virginia Act)  by holders of Shares.  The Board of Directors of
the Company  has also  taken  actions to  exempt  Varlen, the  Purchaser,  their
respective  direct and indirect  subsidiaries and the Offer  and the Merger from
the restrictions  and  provisions of  the  Affiliated Transactions  Statute  and
Control   Share  Acquisitions  Statute  as   well  as  from  the  super-majority
shareholder vote provisions of Article I of the Company's Charter. In  addition,
in  connection with Section  13.1-730 (DISSENTER'S RIGHTS)  of the Virginia Act,
the Board of Directors of the Company  has approved the Merger by a majority  of
"disinterested  directors" (as defined in Section 13.1-725 of the Virginia Act).
See Section 11.
 
    In 1995, in WLR FOODS, INC. V. TYSON FOODS INC., the United States Court  of
Appeals  for the Fourth Circuit ruled that four Virginia anti-takeover statutes,
including the Affiliated  Transactions Statute, the  Control Share  Acquisitions
Statute, the "poison pill statute" and the "business judgment statute" contained
in  the Virginia Act are not preempted by applicable federal securities law, are
constitutional and, even  though the  statutes favor  incumbent management  over
bidders,  do not impermissibly restrict  the ability of a  bidder to take over a
Virginia corporation.
 
                                       30

    A  number of  states have  adopted takeover  laws which  purport, to varying
degrees, to  be applicable  to attempts  to acquire  securities of  corporations
which are incorporated in such states or which have substantial assets, security
holders, principal executive offices or principal places of business therein. To
the  extent that certain provisions of  certain of these state takeover statutes
purport to apply to the  Offer or the Merger,  the Purchaser believes that  such
laws  conflict with  federal law  and constitute  an unconstitutional  burden on
interstate commerce. In 1982, the Supreme  Court of the United States, in  EDGAR
V.  MITE CORP., held  that the Illinois  Business Takeovers Statute,  which as a
matter of state securities law,  made takeovers of corporations meeting  certain
requirements more difficult, imposed a substantial burden on interstate commerce
and  therefore was unconstitutional. In 1987,  however, in CTS CORP. V. DYNAMICS
CORP. OF AMERICA, the Supreme Court of the United States held that the State  of
Indiana could, as a matter of corporate law and, in particular, those aspects of
corporate  law  concerning corporate  governance, constitutionally  disqualify a
potential acquiror from voting  on the affairs of  a target corporation  without
the  prior approval of the remaining  shareholders, provided that such laws were
applicable only under certain conditions. The state law before the Supreme Court
was by its terms applicable only  to corporations that had a substantial  number
of  stockholders in  the state  and were  incorporated therein.  Subsequently, a
number of  Federal  courts  ruled  that various  state  takeover  statutes  were
unconstitutional  insofar as they apply to corporations incorporated outside the
state of enactment.
 
    Except as described herein, the Purchaser does not know whether the Offer is
subject to any state takeover statutes and neither Varlen nor the Purchaser  has
attempted  to comply  with any  state takeover  statutes in  connection with the
Offer. Should any person seek to apply any such statute to the Offer, Varlen and
the Purchaser reserve the  right to challenge the  validity or applicability  of
any  state law allegedly  applicable to the  Offer and nothing  in this Offer to
Purchase nor any action taken in connection herewith is intended as a waiver  of
that  right. In the event that any state takeover statute is found applicable to
the Offer  and  an appropriate  court  does not  determine  that such  laws  are
inapplicable  or invalid as applied to the  Offer, the Purchaser may be required
to file certain information with, or receive approvals from, the relevant  state
authorities, or the Purchaser might be unable to purchase and accept for payment
or  pay for Shares tendered pursuant to the Offer or be delayed in continuing or
consummating the Offer. In the circumstances described above, the Purchaser  may
not  be  obligated to  accept for  purchase and  payment or  pay for  any Shares
tendered.
 
    16.    EXTENSION  OF  TENDER  PERIOD,  TERMINATION  AND  AMENDMENTS.     The
Acquisition  Agreement provides that the Offer may  not be amended to reduce the
price to be paid per Share, change the  form of consideration to be paid in  the
Offer  or the Merger, increase  the Minimum Condition or  amend the terms of the
Offer in a  manner that  is materially  adverse to  the holders  of the  Shares.
Subject to such restrictions, the Purchaser expressly reserves the right, in its
sole  discretion, at any  time from time to  time, to extend  the period of time
during which  the  Offer is  open  by giving  oral  or written  notice  of  such
extension  to  the  Depositary.  If  the Purchaser  shall  decide,  in  its sole
discretion, to increase  the consideration offered  in the Offer  to holders  of
Shares  or make any other  material change in the  terms of the Offer (including
the Minimum Condition) or  the information concerning  the Offer, the  Purchaser
will  disseminate additional tender offer materials  and extend the Offer to the
extent required  by Rules  14d-4(c) and  14d-6(d) under  the Exchange  Act.  The
minimum  period  during  which the  Offer  must remain  open  following material
changes in the  terms of the  Offer or information  concerning the Offer,  other
than  a change  in price or  a change  in percentage of  securities sought, will
depend upon the facts and  circumstances, including the relative materiality  of
the  terms or  information. With  respect to a  change in  price or  a change in
percentage of securities sought, a minimum ten-business day period from the date
of announcement  thereof is  required  to allow  for adequate  dissemination  to
shareholders  and  investor  response. If,  prior  to the  Expiration  Date, the
Purchaser should decide  to increase the  price per Share  being offered in  the
Offer,  such increase  will be applicable  to all shareholders  whose Shares are
accepted for payment pursuant to the Offer. As used in this Offer to  Purchaser,
"business day" has the meaning set forth in Rule 14d-1 under the Exchange Act.
 
                                       31

    The Purchaser also expressly reserves the right (i) to delay payment for any
Shares, regardless of whether such Shares were theretofore accepted for payment,
or  to terminate the Offer and not accept  for payment or pay for any Shares not
theretofore accepted or paid for, upon  the occurrence of any of the  conditions
specified  in Section 13  by giving oral  notice thereof to  the Depositary, and
(ii) subject to the restrictions set forth in the Acquisition Agreement, at  any
time  or from time to time,  to amend the Offer in  any respect. See Section 13.
Any extension, delay,  termination, waiver  or amendment  of the  Offer will  be
followed,  as  soon as  practicable, by  public  announcement thereof,  and such
announcement in the case of  an extension will be  made in accordance with  Rule
14e-1(d)  no later than 9:00 a.m., New York  City time, on the next business day
after the previously scheduled expiration  date. Without limiting the manner  in
which  the Purchaser may  choose to make any  public announcement, the Purchaser
shall have no obligation to publish, advertise or otherwise communicate any such
public announcement other than by  making a release to  either the Dow Jones  or
Reuters News Services and making any appropriate filing with the Commission.
 
    If  the Purchaser extends the Offer, or  if the Purchaser (whether before or
after its acceptance for  payment of Shares)  is delayed in  its purchase of  or
payment  for Shares or is unable to pay for Shares pursuant to the Offer for any
reason, then, without prejudice to the  Purchaser's rights under the Offer,  the
Depositary  may  retain tendered  shares on  behalf of  the Purchaser,  and such
Shares may not  be withdrawn  except to  the extent  tendering shareholders  are
entitled to withdrawal rights as described in Section 3. However, the ability of
the  Purchaser to delay the payment for  Shares which the Purchaser has accepted
for payment is limited by Rule  14e-1(c) under the Exchange Act, which  requires
that  a bidder pay the consideration  offered or return the securities deposited
by or  on behalf  of holders  of securities  promptly after  the termination  or
withdrawal of the Offer.
 
    17.   CERTAIN FEES AND EXPENSES.   Lehman Brothers Inc. ("Lehman") is acting
as Dealer Manager for the Offer and as financial advisor to Varlen in connection
with the  transactions described  in  this Offer  to  Purchase. Pursuant  to  an
engagement  letter dated  March 15, 1996  (the "Engagement  Letter"), Varlen has
agreed to pay Lehman an advisory fee  in connection with the acquisition of  the
Company,  in one or a series or combination of transactions whereby, directly or
indirectly, control (i.e., 51% of the  Shares of the Company), or  substantially
all  of the  assets of the  Company or any  of its affiliates  is transferred to
Varlen or Purchaser or any of  their affiliates (an "Acquisition"), of 0.75%  of
the  gross value  of all  cash, securities and  other property  paid directly or
indirectly by Varlen and/or the Purchaser in connection with an Acquisition (the
"Consideration"); provided that the Acquisition  occurs on or prior to  December
31,  1998 (the "Termination Date"). Varlen has  further agreed that in the event
that Varlen or the Purchaser shall acquire less than 50% of the Shares but  more
than  20%  of the  Shares  outstanding on  a fully  diluted  basis prior  to the
Termination Date,  and during  such  period Varlen  or  Purchaser shall  have  a
designee  appointed to the Company's Board  of Directors, then Varlen has agreed
to pay to Lehman an advisory fee of  0.75% of the price paid by the Company  for
such  shares. Varlen has agreed to pay Lehman the foregoing fees as follows: (x)
one-third  upon  commencement  of  an   Acquisition  and  (y)  two-thirds   upon
consummation  of an Acquisition. Pursuant to the Dealer Manager Agreement, dated
June 20, 1996, Varlen  has also agreed to  pay Lehman a fee  equal to $.065  per
Share  for each  Share accepted  for payment  in the  Offer as  compensation for
serving as Dealer Manager for the  Offer, which amount will be credited  against
the  above-described advisory fee  being paid to Lehman  by Varlen. In addition,
Varlen has agreed  to reimburse  Lehman for its  reasonable expenses  (including
professional  fees and  expenses of  up to $10,000,  plus 50%  of its reasonable
professional fees and expenses in excess of $10,000, up to a maximum of $50,000)
and has agreed to indemnify Lehman  against certain liabilities and expenses  in
connection  with their  engagement. The  amount of  the total  advisory fees and
reimbursable expenses payable to  Lehman pursuant to  the Engagement Letter,  if
the  Acquisition  is  consummated, is  currently  estimated not  to  exceed $1.4
million.
 
    The Purchaser has retained D.F. King &  Co. to act as Information Agent  and
Harris  Trust Company of  New York to  act as Depositary  in connection with the
Offer. The Information Agent may contact  holders of Shares by mail,  telephone,
telex, telegraph and personal interview and may request
 
                                       32

brokers,  dealers and other nominee shareholders to forward material relating to
the offer to beneficial  owners. The Information Agent  and the Depositary  will
receive reasonable and customary compensation for services relating to the Offer
in addition to reimbursement of reasonable out-of-pocket expenses. The Purchaser
has agreed to indemnify the Information Agent and the Depositary against certain
liabilities  and  expenses  in  connection  with  the  Offer  including  certain
liabilities under the federal securities laws.
 
    Neither Varlen nor  the Purchaser will  pay any fees  or commissions to  any
broker,  dealer or other  person (other than the  above-described fee to Lehman)
for soliciting  tenders  of Shares  pursuant  to the  Offer.  Brokers,  dealers,
commercial  banks and trust  companies will, upon request,  be reimbursed by the
Purchaser for reasonable and  necessary costs and expenses  incurred by them  in
forwarding materials to their customers.
 
    18.  MISCELLANEOUS.  The Purchaser is not aware of any jurisdiction in which
the  making  of the  Offer  is not  in compliance  with  applicable law.  If the
Purchaser becomes aware  of any jurisdiction  in which the  making of the  Offer
would  not be in compliance with applicable  law, the Purchaser will make a good
faith effort to  comply with  any such  law. If,  after good  faith effort,  the
Purchaser  cannot comply with any  such law, the Offer will  not be made to, nor
will tenders be accepted from or on behalf of, holders of Shares residing in any
jurisdiction in which the making of the Offer or acceptance thereof would not be
in compliance with the securities, blue sky or other laws of such  jurisdiction.
In  any jurisdiction the securities, blue sky or other laws of which require the
Offer to be made by a licensed broker or dealer, the Offer shall be deemed to be
made on  behalf of  the  Purchaser by  the  Dealer Manager  or  by one  or  more
registered brokers or dealers licensed under the laws of such jurisdiction.
 
    Varlen  and  the Purchaser  have filed  with the  Commission a  Tender Offer
Statement on Schedule 14D-1, together with  exhibits, pursuant to Rule 14d-3  of
the  General Rules  and Regulations under  the Exchange  Act, furnishing certain
additional information  with  respect to  the  Offer, and  may  file  amendments
thereto.  Such  Tender Offer  Statement  and any  amendments  thereto, including
exhibits, may be obtained in the manner  described in Section 8 with respect  to
information  concerning the  Company, except that  such information  will not be
available at the regional offices of the Commission.
 
    NO PERSON  HAS  BEEN AUTHORIZED  TO  GIVE ANY  INFORMATION  OR TO  MAKE  ANY
REPRESENTATION  ON BEHALF OF VARLEN OR THE PURCHASER NOT CONTAINED IN THIS OFFER
TO PURCHASE OR  IN THE LETTER  OF TRANSMITTAL AND,  IF GIVEN OR  MADE, ANY  SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED.
 
                                                        BAS, Inc.
 
                                       33

                                                                      SCHEDULE A
 
          DIRECTORS AND EXECUTIVE OFFICERS OF VARLEN AND THE PURCHASER
 
    The  names and principal business positions for  the past five years of each
director and  executive officer  of Varlen  are set  forth below.  The  business
address  of each such person is 55  Shuman Boulevard, P.O. Box 3089, Naperville,
Illinois 60566-7089. All persons listed below are citizens of the United  States
of America.
 


                NAME                             PRINCIPAL BUSINESS POSITIONS FOR THE PAST FIVE YEARS
- ------------------------------------  ---------------------------------------------------------------------------
                                   
Richard L. Wellek                     Director;  President and Chief Executive Officer of Varlen since 1983. From
                                      1968 through 1983 he  held various executive  and operational positions  at
                                      Varlen.
 
Vicki L. Casmere                      Vice  President, General  Counsel and  Secretary since  April 1,  1996. Ms.
                                      Casmere served as Corporate Counsel of Caremark Inc. from 1992 to 1996  and
                                      as  Vice  President of  Caremark Inc.  from 1994  to 1996.  Previously, Ms.
                                      Casmere served as Corporate Counsel  of Baxter Healthcare Corporation  from
                                      1988 to 1992.
 
Rudolph Grua                          Director;  Vice Chairman of General  Binding Corporation, a manufacturer of
                                      business machines and related supplies,  since January 1995 and a  director
                                      since  May 1984. Prior  to January 1995,  Mr. Grua was  President and Chief
                                      Executive Officer of  General Binding  Corporation, positions  he had  held
                                      since May 1984.
 
George W. Hoffman                     Railroad  Group Vice President since 1990.  Mr. Hoffman was an Executive at
                                      Keystone Railway Equipment Company,  a subsidiary of  Varlen, from 1979  to
                                      1994.
 
Raymond A. Jean                       Executive   Vice  President   and  Chief  Operating   Officer  since  1993.
                                      Previously, Mr. Jean served as Group Vice President from 1988 to 1992.
 
Ernest H. Lorch                       Director; Of  Counsel  to  Whitman  Breed Abbott  &  Morgan,  attorneys,  a
                                      position  he has held since January 1993.  He retired as Chairman and Chief
                                      Executive Officer of The Dyson-Kissner-Moran Corporation ("DKM"), a private
                                      investment company,  in December  1992, a  position he  held since  January
                                      1992.  DKM owned approximately 30%  of the Common Stock  of Varlen prior to
                                      Varlen's purchase of all of the Varlen shares owned by DKM in January 1993.
                                      Mr. Lorch was President of DKM from June 1984 to January 1992. Mr. Lorch is
                                      also a director of Tyler Corporation, a retail supplier of automotive parts
                                      that also provides products for fundraising programs.
 
L. William Miles                      Director;  Vice  President  for  Administration  at  Fairfield  University,
                                      Connecticut,  a position he has held since July 1992. From February 1988 to
                                      June 1992 he was Senior Vice  President of Call Interactive, a provider  of
                                      interactive  telephone services.  Mr. Miles  is also  a director  of Bouton
                                      Corporation, a manufacturer of safety glasses.
 
Richard A. Nunemaker                  Vice President, Finance and Chief Financial Officer since 1991. Previously,
                                      Mr. Nunemaker served as Vice President and Controller from 1987 to 1991.

 
                                      A-1



                NAME                             PRINCIPAL BUSINESS POSITIONS FOR THE PAST FIVE YEARS
- ------------------------------------  ---------------------------------------------------------------------------
Greg A. Rosenbaum                     Director; President of Palisades Associates,  Inc., a merchant banking  and
                                      consulting  company, since August  1989. Mr. Rosenbaum  is also director of
                                      Richey  Electronics,  Inc.,  a  distributor  of  electronic  components,  a
                                      position he has held since 1993.
                                   
 
Joseph J. Ross                        Director; Chairman, President and Chief Executive Officer of Federal Signal
                                      Corporation,  a manufacturer of public safety, signaling and communications
                                      equipment. He has been Chairman of  Federal Signal since February 1990  and
                                      has  served as  its President  and Chief  Executive Officer  since December
                                      1987.
 
Theodore A. Ruppert                   Director; For  more than  the last  five years,  a general  partner in  the
                                      Village  Development  Partnership,  a real  estate,  manufacturing  and oil
                                      development holding company; Chairman, Chief Executive Officer and director
                                      of Glaize Development Corporation, a real estate developer; and a  director
                                      of Pioneer Bank & Trust Company.

 
                                      A-2

               DIRECTORS AND EXECUTIVE OFFICERS OF THE PURCHASER
 
    The  names and principal business  positions for the past  five years of the
director and  executive officers  of  the Purchaser  are  set forth  below.  The
business  address of  each such  person is 55  Shuman Boulevard,  P.O. Box 3089,
Naperville, Illinois 60566-7089. All  persons listed below  are citizens of  the
United  States of America.  For further information  regarding such persons, see
"Directors and Executive Officers of Varlen."
 


                NAME                                         POSITION
- ------------------------------------  -------------------------------------------------------
                                   
Richard L. Wellek                     Director and President
 
Richard A. Nunemaker                  Vice President and Treasurer
 
Vicki L. Casmere                      Vice President and Secretary

 
                                      A-3

    Facsimile copies of the Letter  of Transmittal, properly completed and  duly
executed,  will be accepted. The Letter  of Transmittal, certificates for Shares
and any other required documents should be sent or delivered by each shareholder
of the Company or his  broker, dealer, commercial bank  or other nominee to  the
Depositary at one of its addresses set forth below.
 
                        THE DEPOSITARY FOR THE OFFER IS:
 
                        HARRIS TRUST COMPANY OF NEW YORK
 

                                              
                            ----------------
 
        BY MAIL:           BY OVERNIGHT COURIER:          BY HAND:
 
  Wall Street Station       77 Water Street, 4th       Receive Window
     P.O. Box 1010                 Floor            77 Water Street, 5th
   New York, New York     New York, New York 10005         Floor
       10268-1010                                    New York, New York
                                                           10005
                                BY FACSIMILE
                               TRANSMISSION:
                               (FOR ELIGIBLE
                             INSTITUTIONS ONLY)
                               (212) 701-7636
                               (212) 701-7637
 
                            CONFIRM FACSIMILE BY
                                 TELEPHONE:
 
                               (212) 701-7624

 
                             ---------------------
 
    Any  questions or requests for assistance or additional copies of this Offer
to Purchase, the Letter  of Transmittal, the Notice  of Guaranteed Delivery  and
other  related materials may be directed to  the Information Agent or the Dealer
Manager at their respective  telephone numbers and  locations listed below.  You
may  also  contact your  broker,  dealer, commercial  bank  or trust  company or
nominee for assistance concerning the Offer.
 
                    THE INFORMATION AGENT FOR THE OFFER IS:
 
                             D.F. KING & CO., INC.
                                77 Water Street
                            New York, New York 10005
                            (212) 269-5550 (collect)
                                       or
 
                         Call Toll Free: 1-800-848-3402
 
                      THE DEALER MANAGER FOR THE OFFER IS:
 
                                LEHMAN BROTHERS
                            3 WORLD FINANCIAL CENTER
                            NEW YORK, NEW YORK 10285
                         (212) 526-2864 (CALL COLLECT)