Estone High Quality Car Auto Side Post Battery Master Disconnect Cut Off Switch Designed specifically for use on General Motors vehicles with side post batteries, this switch provides a clean, solid, low profile connection to GM side post batteries. The switch makes it simple to disconnect your battery to work on your vehicle or the knob can be removed to prevent theft. It also works great to eliminate battery drain if youre storing a vehicle for an extended period of time. Material: brass plated + zinc alloy + plastic Each package with a cell phone chain Which has "Estone" LOGO