SAFE TO USE: The thread on the 12v battery disconnect switch screw is more refined, which makes it easier to turn the switch when turning on or off and provides a perfect lock when installing. At the same time, ensure that the green switch will not slide down easily and cause accidental closure when the power is off. ZINC ALLOY COPPER-PLATED BATTERY DISCONNECT SWITCH: The 12v battery disconnect switch is made of solid copper-zinc alloy with excellent electrical conductivity. Anti-corrosion and rust protection, long service life. 400A BATTERY SWITCH: The battery disconnect switch is suitable for a voltage of 6-24V. The rated current is 400A. Suitable for 16-18mm battery poles. REDUCE CORROSION: The included anti-corrosion gasket can effectively protect the battery and battery switch, avoid contact point corrosion and durable. MULTIPURPOSE BATTERY MAIN SWITCH 12V: The car battery switch is suitable for solving the leakage problem of batteries in cars, boats, trucks, caravans, motorcycles and mobile homes.