COVERT 0.3125 in Master Lock Security Cable Black Case of 4 The Covert Master Lock 0.3125 inch Black Cable Case of 4 features cable locks that adjust from 6 inches to 6 feet and fits both the Covert Bear and Security safes. It features cut resistant and scratch resistant, vinyl coated cable and ABS plastic lock body bumper. The lock has a pick resistant pin tumbler mechanism. These cable locks come in a pack of 4 and feature a limited lifetime warranty.