Do not require any installation tools! Made from nylon, this device has a small metal tongue that locates under the breaker cross bar. The thumbwheel is adjusted to lock onto the bar and prevents the breaker being switched. Recommended to use together with a padlock(shackle diameter≤ 7mm) Suitable for MCBs with tie rods, singel breakers and multi-pole circuit breakers 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.