Our circuit breaker lockout doesn't require any tools for securing onto the breaker. A simple thumbscrew facilitates quick and easy installation. Suitable for 120/277V breakers measuring 9/16″ W x ⅜ '' L, the lockout has dimensions of 1 ⅜ ″ H x 2″ L x ⅞ ″ W, accommodating one padlock with shackles up to 9/32″. Crafted from durable polypropylene and nylon, the device includes a detachable cleat for secure restraint on breakers with lengthy, sliding switch throws.