LOTOTO L3821 Safety Lockout Tagout Clamp-On Circuit Breaker Lockout Tagout Device, made of rugged polypropylene and impact modified Nylon. For 120-277V breaker Lockout, handle width 16.5mm.Product Features* LOTOTO L3821 Safety Loto Clamp-On Circuit Breaker Lockout, Handle width 16.5mm* Can be used with lockout cleats in the bottom for hard locking long sliding switches and switches with large angular rotation* Can be easy operated without any tools* Accepts lock shackles up to 9/32inch (7.5mm) in diameter* For 120-277V breaker Lockout, handle width 16.5mm.