Description: MaterialThe top post cutoff switch is made of zinc alloy, copper, Sturdy structure FeatureThis switch fits the slightly smaller negative post of all standard sized automotive top post batteries. On/Off 2 position, top post terminal FunctionBattery Terminal Link Switch can be used for cables to isolate and secure the electrical system, avoid unauthorized use of your vehicle or unwanted battery consumption when not used for long periods of time Easy to UseBattery Terminal Link Switch Isolator with Knob is installed directly onto a terminal, just follow the direction instructions on the switch, unscrewing or tightening the switch into an "on" or "off" position to control current ApplicationUniversal Battery Disconnect Switch suitable for 12V cars, boats, trucks, RVs and more Size Chart:8.5cmx3.2cm/3.35inchx1.26inch Package Includes: 1 Universal Car Battery Switch Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.