Grip Tight (tm) circuit breaker lockout. Fits virtually all circuit breakers you will find in a lockout situation. Includes one 491B and one 493 Grip Tight circuit breaker lockouts. 491B fits wide or tall breaker toggles typically found on hi-voltage/hi=amperage breakers. 493B fits standard height and tie-bar toggles typically found on 120 and 240 volt breakers. Accepts all American Lock and Master Lock safety padlock shackles and lockout hasp diameters.