This oversized 480/600V frame lockout fits breaker switches up to 2-1/4 in. wide and 7/8 in. thick and applies in seconds with thumbscrew mechanism, no screwdriver needed. Oversized Clamp-On Breaker Lockouts are made of durable polypropylene and glass-filled impact-modified nylon. This lockout device isolates and secures circuit breaker switches to protect employees against electrical accidents during equipment maintenance. Electrical lockout lockouts body and button part are made of reinforced nylon PA material with wear resistance, corrosion resistance, good insulation and temperature difference resistance (-50℃~+177℃). The miniature circuit breaker lockouts do not require any installation tools! The lock body comes with a button buckle design, and the installation can be easily completed by manually pressing the button. And The lever-type circuit breaker lock uses a finger-turned first wheel for quick installation. Suitable for a variety of single-stage, multi-stage and any miniature circuit breakers to protect employees from electrical accidents during equipment maintenance.