Up for auction, Is a master service key and a square female mainspring winding key (mainspring key fits the mechanical coin/clock mechanism with the SQUARE POST ONLY!). If you have a mechanism with a square hole, I offer an adapter with mounting plate for an additional charge of $8.99 (see other auctions).... If your coin/clock mechanism has a "Torx like" post, I can not help you with that style of key. Please see additional pictures to make sure that the keys ...are correct for your meter. I have a very large selection of Drive-In Speaker and Parking Meter parts, please let me know what you might be looking for! Again, you are bidding on BOTH KEYS in the 1st Picture ! PLEASE make sure that this is the correct style for your meter. If you win more than one auction, please let me know, and I will try to combine items in one shipping carton, in an effort to save you some money on postage! PLEASE let me know BEFORE making payment.As always, local buyers can arrange for FREE local pick-up!Please let me know if you have any questions!Drive-In Mfg. Company ® is now a Trademark of Wolf Enterprises