High-quality material: Our circuit breaker switch key is made of high-quality ABS plastic and solid brass nut. The bolt is firmly connected to the brass part. Both are not easy to loosen, rust, or corrode. It has a long service life and can be used for a long time. Safe and reliable: The battery disconnect switch key can quickly disconnect the circuit, prevent fluid leakage and battery loss, and extend battery life. It also safely disconnects the battery and eliminates any battery drain, helping you save energy. Easy installation: Our battery disconnect switch is ergonomically designed and fits perfectly on the thumb for easy operation. You only need to turn the battery knob slightly, and the spare key can realize the disconnection and reconnection of the battery, and the operation is simple Utility Tool：This battery disconnect switch is used in 12-24 volt systems to isolate and protect the electrical system; when the vehicle is not in use, it removes all current draw from the battery