This is a well designed car battery disconnect switch. Suitable for different types of batteries with terminal diameters of 15-17 mm. Please measure your car battery pile head, then decide to buy the disconnect car battery switch. Electrical Battery Isolator Switch Save your car power, protect the whole system of emptying. Save the trouble of having to go to a technician or others for help, it's always a waste of time and money. Easy to turn off power cut-off switch, you allowing you to quickly disconnect your battery for safety, car maintenance or storage. Easy to use, to open the power supply just squeeze the green knob by hand and slightly loosen the green knob to disconnect. Battery master cutout and immobilizer system for cars and trucks with batteries of the Top Post type. Especially for some old cars, the battery system is very fragile and won't restart if you leave them parked for a long time. Here is the cure! Battery cut-off switch with universal terminals (cars, trucks, boats) and green knob. For 6V/12V/24V batteries, 400 amps surge and 125 amps continuous. Universal for cars, boats, trucks, RVs and more.