Precision Engineered Breaker Lock - Circuit breaker clamp on style engineered to lock out single-pole breakers with toggles up to 5/8-inch x 1/2-inch, isolates hazardous energy and prevents unauthorized access Rugged Circuit Breaker Locks - Single handle lockout breaker made of impact-resistant, non-conductive red polypropylene and black nylon, suitable for heavy industrial use Premium Breaker LOTO Devices - (10) 120 to 277 Volts red single pole breaker locks with 19/64-inch diameter padlock shackle hole, thumbscrew that has a stainless steel screw and nylon knob for fast and firm deployment, no tools required OSHA Compliant - Lockout tagout breaker lock developed and tested to help businesses exceed compliance with standards Trusted Safety Supplier - TRADESAFE is an established USA based and owned industry expert and reliable safety partner for LOTO compliance supplies