Do not require any installation tools! Pin-In standard (PIS). a.Made from engineering plastic strengthened nylon PA. b.Suitable for most existing types of Circuit Breakers in the market. c.Easily installed with the aid a push button or rotate roller. d.Available for single and multi-pole circuit breaker e.Recommended to use in combination with a padlock for added safety. f.Can use padlocks with a shackle diameter up to 7mm. Electrical lockout lockouts body and button part are made of reinforced nylon PA material with wear resistance, corrosion resistance, good insulation and temperature difference resistance (-50℃~+177℃). The miniature circuit breaker lockouts do not require any installation tools! The lock body comes with a button buckle design, and the installation can be easily completed by manually pressing the button. And The lever-type circuit breaker lock uses a finger-turned first wheel for quick installation. Suitable for a variety of single-stage, multi-stage and any miniature circuit breakers to protect employees from electrical accidents during equipment maintenance.