Master Lock 3UP Universal Pin Laminated Padlock 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 Universal pin padlocks for keying convenience Locks pinned to customer's key in minutes Laminated steel bodies for superior strength Hardened steel shackles 4 pin tumbler cylinders helps prevent picking