GRANT PRIDECO, INC.
NOTICE OF GUARANTEED DELIVERY
FOR TENDER OF 9% SENIOR NOTES DUE 2009
(PRINCIPAL AMOUNT $1,000 PER NOTE)
A holder of 9% Senior Notes due 2009 (the "Outstanding Notes") of Grant
Prideco Escrow Corp. (which was merged with and into Grant Prideco, Inc. on
December 20, 2002) who wishes to tender such Outstanding Notes pursuant to the
exchange offer (the "Exchange Offer") extended by the Prospectus dated
, 2003 (the "Prospectus") and the Letter of Transmittal accompanying
this Notice of Guaranteed Delivery (the "Letter of Transmittal") must complete
and deliver this form or one substantially equivalent to it under the following
circumstances: (i) certificates representing the Outstanding Notes are not
immediately available, (ii) the Outstanding Notes or other required documents
will not reach the Exchange Agent prior to the Expiration Date (as defined in
the Letter of Transmittal and the Prospectus), or (iii) the appropriate
procedures for book-entry transfer will not be completed prior to the Expiration
Date. This requirement is set forth in the Prospectus in the section entitled
"The Exchange Offer -- Procedures for Tendering" and in the Letter of
Transmittal in Instruction 2. This form may be delivered by hand or sent by
overnight courier, facsimile transmission or registered or certified mail to the
Exchange Agent. The Exchange Agent must receive this form prior to 5:00 p.m.,
New York City time, on , 2002.
To U.S. Bank National Association
(the "Exchange Agent")
<Table>
By Hand Delivery: By Overnight Courier:
U.S. Bank Trust Center U.S. Bank Trust Center
180 East Fifth Street 180 East Fifth Street
St. Paul, Minnesota 55101 St. Paul, Minnesota 55101
Attn: Specialized Finance Group Attn: Specialized Finance Group
By Registered or Certified Mail: By Facsimile Transmission
U.S. Bank Trust Center (for Eligible Institutions Only):
180 East Fifth Street U.S. Bank Trust National Association
St. Paul, Minnesota 55101 (651) 244-1537
Attn: Specialized Finance Group Confirm: (800) 934-6802
</Table>
DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OR TRANSMISSION TO
A FACSIMILE NUMBER OTHER THAN AS SET FORTH ABOVE
WILL NOT CONSTITUTE A VALID DELIVERY.
THIS NOTICE OF GUARANTEED DELIVERY IS NOT TO BE USED TO GUARANTEE
SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE
GUARANTEED BY AN "ELIGIBLE INSTITUTION" UNDER THE INSTRUCTIONS THERETO,
SUCH SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED
IN THE BOX ON THE LETTER OF TRANSMITTAL FOR GUARANTEE OF SIGNATURES.
Ladies and Gentlemen:
I, the undersigned, hereby tender to Grant Prideco, Inc. the principal
amount of the Outstanding Notes listed below, upon the terms of and subject to
the conditions set forth in the Prospectus and the Letter of Transmittal and the
instructions thereto, which I have received, pursuant to the guaranteed delivery
procedures set forth in such Prospectus, as follows:
<Table>
<Caption>
AGGREGATE PRINCIPAL
AMOUNT REPRESENTED PRINCIPAL AMOUNT
CERTIFICATE OR BY OUTSTANDING TENDERED (MUST BE IN INTEGRAL
REGISTRATION NUMBERS NOTE(S) MULTIPLES OF $1,000)
-------------------- ------------------- -----------------------------
- ------------------------------- ------------------------------- -------------------------------
- ------------------------------- ------------------------------- -------------------------------
- ------------------------------- ------------------------------- -------------------------------
- ------------------------------- ------------------------------- -------------------------------
</Table>
If Outstanding Notes will be tendered by book-entry transfer, provide the
following information:
DTC Account Number: ------------------------------------------------------------
Transaction Code (if available): -----------------------------------------------
Date: --------------------------------------------------------------------------
All authority herein conferred or agreed to be conferred shall survive the
death or incapacity of the undersigned and every obligation of the undersigned
hereunder shall be binding upon the heirs, personal representatives, successors
and assigns of the undersigned.
PLEASE SIGN HERE
X ------------------------------------------------------------------------------
X ------------------------------------------------------------------------------
SIGNATURE(S) OF OWNER(S) OR AUTHORIZED SIGNATORY
Date: --------------------
Taxpayer Identification Number or Social Security Number: ----------------------
Area Code and Telephone Number: ------------------------------------------------
Must be signed by the holder(s) of the Outstanding Notes as their name(s)
appear(s) on certificates for Outstanding Notes or on a security position
listing, or by person(s) authorized to become registered holder(s) by
endorsement and documents transmitted with this Notice of Guaranteed Delivery.
If signature is by a trustee, executor, administrator, guardian,
attorney-in-fact, officer or other person acting in a fiduciary or
representative capacity, such person must set forth his or her full title below.
PLEASE PRINT NAME(S) AND ADDRESS(ES)
Name(s): -----------------------------------------------------------------------
Capacity: ----------------------------------------------------------------------
Address(es): -------------------------------------------------------------------
THE GUARANTEE ON THE NEXT PAGE MUST BE COMPLETED
2
GUARANTEE OF DELIVERY
(NOT TO BE USED FOR SIGNATURE GUARANTEE)
I, the undersigned, a firm or other entity identified as an "eligible
guarantor institution" within the meaning of Rule 17Ad-15 under the Securities
Exchange Act of 1934, as amended, guarantee (a) that the above named person(s)
own(s) the principal amount of 9% Senior Notes due 2009 of Grant Prideco Escrow
Corp. (which was merged with and into Grant Prideco, Inc. on December 20, 2002)
(the "Outstanding Notes") tendered hereby within the meaning of Rule 14e-4 under
the Securities Exchange Act of 1934, as amended, (b) that such tender of such
Outstanding Notes complies with Rule 14e-4, and (c) that I will deliver to the
Exchange Agent the certificates representing the Outstanding Notes tendered
hereby or confirmation of book-entry transfer of such Outstanding Notes into the
Exchange Agent's account at The Depository Trust Company, in proper form for
transfer, together with the Letter of Transmittal (or facsimile thereof),
properly completed and duly executed, with any required signature guarantees and
any other required documents, within five (5) business days after the Expiration
Date.
<Table>
- ------------------------------------------ ------------------------------------------
NAME OF FIRM AUTHORIZED SIGNATURE
- ------------------------------------------ ------------------------------------------
ADDRESS TITLE
- ------------------------------------------ Name -------------------------------------
ZIP CODE PLEASE TYPE OR PRINT
- ------------------------------------------ Dated ------------------------------------
AREA CODE AND TELEPHONE NUMBER
</Table>
NOTE: DO NOT SEND CERTIFICATES REPRESENTING OUTSTANDING NOTES WITH THIS
FORM. CERTIFICATES REPRESENTING OUTSTANDING NOTES SHOULD BE SENT
ONLY WITH A LETTER OF TRANSMITTAL.
3