Purpose and benefits: Used for equipment maintenance and shutdown lockout to ensure that the circuit breaker remains locked during maintenance, overhaul, or servicing. Key specifications: Aperture 9 mm (0.35 in); Width 14 mm (0.55 in); Card slot distance 8 mm (0.31 in); Total length 57 mm (2.2 in); Package contains 2 pcs x circuit breaker lockout; Suitable for circuit breakers with handle thickness less than 8 mm. Material and durability: Nylon body is sturdy and not easily deformed, offering durable and temperature resistant performance. Installation and usability: Includes locking screw for tool installation; simple and convenient. Suitable for both singlepole and multipole circuit breakers. Use scenarios: Electrical panel maintenance in facilities to prevent reenergization during service. Machine maintenance or where power must be isolated safely. Routine lockout/tagout procedures for electrical distribution equipment in industrial environments.