Premium Quality: Battery disconnect switch 12v battery isolator made of heavy duty solid brass, rust and corrosion resistant, greatly protect the battery disconnect isolator from rust and corrosion, durable for long term safety use Must Have Battery Disconnect Switch: Battery disconnect switch protects everything from cars to boats to semis with this knob, handling 12V of up to 125A continuous & 500A momentary current. It is ideal for cars, boats, trucks, RVs vehicle and electrical equipment batteries. Easy Use: battery kill switch is convenient to use. Simply to engage power by hand tighten the green knob and slightly loosen the green knob to disconnect all power. Make sure the negative battery post and battery clamp (original battery connector) clean before install Wide Application: battery disconnect switch is suitable for most top post terminal (15-17 mm cone battery negative post). Please make sure this battery terminals top post kill switch for car use under the condition of 12V voltage, 125 A, knob type Safety Protection: Battery cut off switch 12v is designed to cut-off power flowing of the vehicles battery to avoid unauthorized use of your vehicle or unwanted battery consumption when not used, prevent vehicles from battery drain and reduces the risk of electrical fire