IDEAL Oversized Circuit Breaker Lockout System is suitable for oversized 480/600V Circuit Breakers and can be permanently installed into an electrical panel, putting all lockout items handy at the point of need. Installing is easy with adhesive mounting rails, no tools required! The Oversized Circuit Breaker Lockout System also features pegs in the mounting rails that mate with holes in locking arms for security of arm when lock is in place. Red arms that lock for OFF and green arms that lock for ON. System is RoHS compliant.