THIS  DEBENTURE  HAS BEEN ACQUIRED FOR  INVESTMENT  PURPOSES ONLY AND MAY NOT BE
TRANSFERRED UNTIL (i) A REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "ACT") SHALL HAVE BECOME  EFFECTIVE WITH RESPECT THERETO OR (ii)
RECEIPT BY THE ISSUER OF AN OPINION OF COUNSEL  REASONABLY  SATISFACTORY  TO THE
ISSUER  TO THE  EFFECT  THAT  REGISTRATION  UNDER  THE  ACT IS NOT  REQUIRED  IN
CONNECTION  WITH SUCH  PROPOSED  TRANSFER NOR IS IN VIOLATION OF ANY  APPLICABLE
STATE SECURITIES LAWS.

                             SUBORDINATED DEBENTURE

$300,000.00                                                       March 28, 1996

Two (2) years after date, The Lehigh Group, Inc., located at 810 Seventh Avenue,
New York,  NY 10019,  (the  "Company")  promises to pay to the order of Macrocom
Investors LLC located at  _________________________________________  ("Lender"),
the principal sum of THREE HUNDRED THOUSAND  ($300,000) DOLLARS with interest at
the rate of two (2%)  percent  per annum  over the prime  lending  rate of Chase
Manhattan Bank.,  N.A.  Interest on the principal amount of this Debenture shall
be paid monthly, beginning on the 1st day of May, 1996 and monthly thereafter on
the first day of each subsequent  month next ensuing through and including April
1, 1998.  On April 1, 1998,  the principal  outstanding  balance and all accrued
interest shall become due and payable.

WARRANT

The Company shall issue to Lender a five (5) year warrant to purchase the number
of shares  equal to $300,000  divided by the price equal to the average  closing
bid price of the  Company's  common stock for the ten business days prior to the
date of closing of the financing.  The Company can repurchase the warrant during
the end of each the first and second year upon full  repayment  of the loan at a
price as follows:  20% of the loan balance during the first year plus 20% of the
loan balance  during the second year if the loan remains  outstanding  after the
first year.  The common stock  received  upon exercise of the warrant shall have
unlimited piggyback registration rights.

COLLATERAL

To  secure  the  payment  and  performance  of  the  Company's  obligation,  the
undersigned hereby pledges to Lender, a continuing  security interest consisting
of one hundred percent (100%) of the issued and outstanding  common stock of its
wholly owned  subsidiary,  HallMark  Electrical  Supplies Corp.  This collateral
shall not be encumbered by

                                                                               1

or  used  to  secure  any  other  indebtedness  of  the  Company  or  any of its
subsidiaries.

COVENANTS OF COMPANY

    A. The Company covenants and agrees that, so long as this Debenture shall be
outstanding, it will:

         (i) Promptly  pay and  discharge  all lawful  taxes,  assessments,  and
governmental  charges or levies  imposed upon the Company or upon its income and
profits,  or upon any of its property,  before the same shall become in default,
as well as all lawful claims for labor, materials and supplies which, if unpaid,
might  become  a lien or  charge  upon  such  properties  or any  part  thereof:
PROVIDED,  HOWEVER,  that the Company shall not be required to pay and discharge
any such tax, assessment,  charge, levy or claim so long as the validity thereof
shall be  contested  in good faith by  appropriate  proceedings  and the Company
shall set aside on its books  adequate  reserves  with  respect to any such tax,
assessment, charge, levy or claim so contested;

         (ii) Do or cause to be done all things reasonably necessary to preserve
and keep in full force and effect its corporate existence, rights and franchises
and comply with all laws applicable to the Company,  except where the failure to
comply would not have a material adverse effect on the Company.

         (iii) At all times reasonably maintain,  preserve, protect and keep its
property  used or useful in the conduct of its business in good repair,  working
order and condition,  and from time to time make all needful and proper repairs,
renewals,  replacements,  betterments  and  improvements  thereto  as  shall  be
reasonably required in the conduct of its business;

         (iv) To the extent  necessary for the  operation of its business,  keep
adequately insured by all financially sound reputable insurers,  all property of
a  character  usually  insured  by  similar  corporations  and carry  such other
insurance as is usually carried by similar corporations;

         (v) At all times keep true and correct books, records and accounts.

         (vi) Not issue any new debt or equity securities or make  distributions
that would reduce HallMark Electrical  Supplies Corp.'s equity.  Notwithstanding
the  foregoing,  HallMark may incur debt of up to $3,500,000 on a line of credit
or loan facility as permitted by its borrowing base.

EVENTS OF DEFAULT

    1. This  Debenture  shall become and be due and payable upon written  demand
made by the holder hereof if one or more of the following events,  herein called
events of default,

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shall happen and be continuing:

         (i) Default in the  payment of the  principal  and accrued  interest on
this Note when and as the same shall become due and payable.

         (ii)  Default in the due  observance  or  performance  of any  material
covenant,  condition  or  agreement on the part of the Company to be observed or
performed  pursuant to the terms hereof and such default shall continue  uncured
for thirty (30) days after  written  notice  thereof,  specifying  such default,
shall have been given to the Company by the Lender.

         (iii)  Application  for, or consent to, the  appointment of a receiver,
trustee or liquidator of the Company or of its property;

         (iv) General assignment by the Company for the benefit of creditors;

         (v) Filing by the Company of a voluntary  petition in  bankruptcy  or a
petition or an answer seeking reorganization,  or an arrangement with creditors;
and

         (vi) Entering against the Company of a court order approving a petition
filed against it under the Federal  bankruptcy  laws, which order shall not been
vacated or set aside or otherwise terminated within sixty (60) days.

    2. The Company  agrees that notice of the occurrence of any event of default
will be  promptly  given to the  holder  at this or her  registered  address  by
certified mail.

    3. The Company will be  considered in default if it is delisted from the New
York Stock Exchange or the net worth of HallMark is less than $1,500,000.

CLOSING

The  consummation of the transaction  provided for herein (the "Closing")  shall
take place at the office of the Company at 810 Seventh Ave.-27F,  NY NY 10019 at
10:00 AM no later than March 28,  1996 or at such other  place and on such other
date as shall be agreed upon, in writing, by the Company and Lender.

At Closing the Lender  shall  deliver to the  Company,  a certified or cashier's
check (or wire  transfer to Lender's  account)  made payable to the order of the
Company in the amount of $300,000.  If the Lender  chooses to wire said funds to
the Company the information is as follows:

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                  Chase Manhattan Bank
                  101 Park Ave.-1st Floor
                  New York, NY 10178
                  212/972-8135
                  Branch Manager, Mr. Peter Quintana
                  Chase ABA # 021000021
                  The Lehigh Group Checking Account # 361 1 130828

SUBORDINATION

This  Debenture  shall  be  subordinated  to all  indebtedness  of  the  Company
regardless of whether incurred on, before or after the date of this Debenture.

The  obligations  of the  parties  hereto,  shall be governed by the laws of the
State of New York.



Dated:  March 28, 1996

MACROCOM INVESTORS LLC                 THE LEHIGH GROUP INC.



By:/s/ Michael Millon                  By:/s/ Salvatore J. Zizza,
   ------------------                     -----------------------
   Michael Millon,                          Salvatore J. Zizza,
   Managing Member                          President


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