Circuit breaker locking system System made of Red NylonInstallation method :1. A safe and effective method for locking miniature circuit-breakers; universal for European and Asian equipment2. No tools are required to install the miniature circuit breaker. You just need a button to complete the installation easily.3. the thumb wheel is used for push rod type locks for quick completion of the installation; available as single pole and multi pole circuit breakers for choice4. it is suggested to use the product with the security padlocks of the best safe or other padlocks; can use padlocks with a shackle diameter of 7mm.