The Master Lock No. S2394 Universal Miniature Circuit Breaker Lockout Device locks virtually all miniature ISO/DIN pin-out circuit breakers throughout the world. The patented device features a thumb turn dial screw for easy attachment, no tools required. Device attaches to circuit breaker and makes dial inaccessible in the locked position to prevent removal. It works with all safety padlocks which can be applied horizontally or vertically and lockout hasps. Can be mounted side-by-side on adjacent miniature circuit breakers. Durable thermoplastic material is chemical resistant and performs effectively in extreme environments.