Brady Red LOTO-14 Polypropylene and Impact Modified Nylon 120/277 V Clamp-On Breaker Lockut accepts Lockshackles up to 9/32" Dia and works on a wide range of single-pole as well as internal-trip multi-pole breakers. Breaker Lockut uses patented thumbscrew design to easily install and does not require screwdrivers. Lockut is securely tightened onto switch tongue and cover is pulled over thumbscrew as well as Lockto prevent clamp from being loosened. Rugged Lockut features cleats for use with breakers along long, sliding switch throws.