Lockout devices control energy sources and ensure machine and equipment remain inoperable to prevent unexpected start-up or release of stored energy in accordance with OSHA 29 CFR 1910.147 requirements. The single pole circuit breaker lockout features a bar clamp design, allowing the device to slide onto a breaker switch and lock securely into place. Simply lift handle open, slide onto the breaker bar, then close the handle down and secure with a padlock (sold separately). Fast secure ratchet application and quick-release tab for removal. Metal jaws for optimum grip. Octagon peg allows specially designed tab tags to be secured directly to the device (sold separately). Accommodates padlock shackles up to 9/32 in diameter (sold separately).