Snap-On Breaker Lockouts are quick and easy to install - just snap in place and apply lock. Designed for 120V breakers that have holes in the switch tongue. Dual cavities in the Snap-On Breaker Lockouts accommodate different size switch tongues. This lockout device isolates and secures circuit breaker switches to protect employees against electrical accidents during equipment maintenance. Equipping your employees with the proper lockout tools and warning devices can save lives, reduce lost employee time, and cut insurance costs. Brady® is a world leader in lockout/tagout products and services offering industry expertise and a broad range of durable, easy-to-use lockout devices.