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. Equipping your employees with the proper lockout tools and warning devices can save lives, reduce lost employee time, and cut insurance costs. Brady® is a world leader in lockout/tagout products and services offering industry expertise and a broad range of durable, easy-to-use lockout devices.