This Oversized Clamp on Breaker Lockout 480/600V frame lockout fits breaker switches up to 58mm wide and 22mm thick and it applies in seconds with thumbscrew mechanism. No additional tool is required to install the device. It is made from durable polypropylene and glass-filled impact-modified nylon. The lockout device isolates and secures circuit breaker switches to protect employees against electrical accidents during equipment maintenance.