"This miniature circuit breaker lockout device is the standard pin-in model which is easily installed with the aid of a push button - no tools required. It offers an effective and safe method for locking out miniature circuit breakers and offers superior chemical resistance.Type = Circuit Breaker LockoutMaterial = Glass Fibre Reinforced Plastic, Stainless SteelNumber of Locks = 1Lock Shackle Maximum Diameter = 7mm"