EXHIBIT 99.7

                                 PENTACON, INC.

                               OFFER TO EXCHANGE

                                      ITS

              12 1/4% SENIOR SUBORDINATED NOTES DUE 2009, SERIES B
                             FOR ANY AND ALL OF ITS
              12 1/4% SENIOR SUBORDINATED NOTES DUE 2009, SERIES A

             INSTRUCTION TO REGISTERED HOLDER FROM BENEFICIAL OWNER

     The undersigned acknowledge(s) receipt of your letter and the enclosed
Prospectus and the related Letter of Transmittal, in connection with the offer
by Pentacon, Inc. (the "Company") to exchange the 12 1/4% Senior Subordinated
Notes due 2009, Series A (the "Old Notes").

     This will instruct you to tender the principal amount of Old Notes
indicated below held by you for the account of the undersigned, upon the terms
and subject to the conditions set forth in the Prospectus and the related Letter
of Transmittal.

     The undersigned represents that (i) the 12 1/4%Senior Subordinated Notes
due 2009, Series B (the "Exchange Notes") to be acquired pursuant to the
Exchange Offer in exchange for the Old Notes designated below are being obtained
in the ordinary course of business of the person receiving such Exchange Notes,
(ii) neither the undersigned nor any other person receiving such Exchange Notes
is participating, intends to participate, or has any arrangement or
understanding with any person to participate, in the distribution of such
Exchange Notes, and (iii) it is not an "affiliate," as defined under Rule 405
of the Securities Act of 1933 (the "Securities Act"), of the Company or, if it
is an affiliate, that it will comply with the registration and prospectus
delivery requirements of the Securities Act to the extent applicable.

     If the undersigned is a "broker" or "dealer" registered under the
Securities Exchange Act of 1934 that acquired Old Notes for its own account
pursuant to its market-making or other trading activities (other than Old Notes
acquired directly from the Company), the undersigned understands and
acknowledges that it may be deemed to be an "underwriter" within the meaning
of the Securities Act and, therefore, must deliver a prospectus relating to the
Exchange Notes in connection with any resales by it of Exchange Notes acquired
for its own account in the Exchange Offer. Notwithstanding the foregoing, the
undersigned does not thereby admit that it is an "underwriter" within the
meaning of the Securities Act.

YOU ARE HEREBY INSTRUCTED TO TENDER ALL OLD NOTES HELD FOR THE ACCOUNT OF THE
UNDERSIGNED UNLESS OTHERWISE INDICATED BELOW.

[ ] DO NOT TENDER ANY OLD NOTES
[ ] TENDER OLD NOTES IN THE AGGREGATE PRINCIPAL AMOUNT OF
$________________________

SIGNATURE:
________________________________________________________________________________
                    NAME OF BENEFICIAL OWNER (PLEASE PRINT)
By _____________________________________________________________________________
                                     SIGNATURE
________________________________________________________________________________
                                    ADDRESS
________________________________________________________________________________
                         AREA CODE AND TELEPHONE NUMBER

DATED:               , 1999