Disconnect Switch for Auto/Marine Battery: The on/off switch is to be used for side battery terminals. It is designed to prevent battery from draining during storage or not in use. Good to save battery life Easy to Install and Operate: Knob type. Turn to the left (counterclockwise) to break the battery connection and turn to the right (clockwise) to reconnect. Quick and simple way to disconnect battery Durable&High Quality: The battery cut off switch is made of zinc alloy with brass plating, corrosion resistance. Used for battery negative post 3/8" hole, DC 12 V system, rated current: 125 A Rest Assured to Purchase: We offer 30-day money-back for any reason, 12-month warranty for quality-related issues. Any problem in using our battery disconnect switch, please kindly contact us, your problem will be solved within 24 HOURS Widely Used: Used for GM side post batteries or other batteries which have a 3/8" side post terminal, also used for electrical equipment