SKILCRAFT®480/600V Clamp-On Circuit Breaker Lockout fits circuit breakers 1-1/16 W x 3/8 L. The lockout measures 1-3/4"H, 2-3/4''L, 1-13/16"W and accommodates 1 padlock, with shackles up to 9/32". The thumbscrew feature allows the device to be installed quickly and easily. The lockout is made from durable plastic (polypropylene) and nylon, and includes a detachable cleat.