COMPATIBLEThis side mount battery disconnect switch is easy to install on Negative battery side post (Only). Rated 500 amps surge and 125 amps continuous at 12 volts. With a -inch hole suitable for negative terminal EASY TO USEThis compact knob style battery disconnect switch is installed directly onto a battery terminal and work by unscrewing or tightening the battery switch into an on or off position to control electrical flow. Knob can be removed completely to deter theft HIGH QUALITYOur side post battery cutoff switch is made of Zinc Alloy Copper Plating. It features superior performance and good conductivity. This battery kill switch is rust and corrosion resistant NO BATTERY DRAINThis battery isolator switch provides a reliable way to shut down electrical power during maintenance and protect batteries from excessive drain. It also acts as a deterrent for car theft. By simply unscrewing its cap, you keep your car safe from thieves WIDELY APPLICATIONThis battery shutoff switch is ideal for cars, boats, trucks, RVs, Vehicles, motor homes, jet skis, motorcycles, race cars and more side post battery devices with 3/8 diameter terminal