SKILCRAFT® Clamp-on Circuit Breaker with detachable cleat lockout device is 120/277V and fits circuit breakers 3/8" x 9/16". The lockout measures 2" x 7/8" x 1-3/8" and accommodates one padlock, with shackles up to 9/32". The thumbscrew feature allows the device to be installed quickly and easily. Device is made from durable plastic and nylon. Made in the U.S.A. Six per package.