Product Description For use with Master Lock Universal pin Keying system. 1-9/16" Wide laminated case 4-pin tumbler security. Dual steel levers Lock both sides of case-hardened 9/32" Diameter steel shackle. 5/8" Horizontal clearance. Universal pin padlocks are for use with Master Lock Universal pin Keying system. The system utilizes a mounted fixture or punch tool to Shear the serrated pins to fit a customer's existing padlock key. Padlocks do not include keys. The Universal pin system will only work with Master Lock original key blank or the M1 blank. To order refer to, padlock rekeying tool. From the Manufacturer The Master Lock Laminated Steel Pin Tumbler Padlock features a 1-9/16 inches wide laminated steel body for superior strength. This padlock has a universal pin for keying convenience. The four-pin cylinder helps prevent picking and dual locking levers provide extra pry resistance. A 1-1/2-inch hardened steel shackle guarantees extra cut resistance. Locks are pinned to the customer's key in minutes. Master Lock offers a full line of padlocks, chains, cables, and specialty locks for all of your needs.