This is a well-designed car battery disconnect switch. Suitable for various types of batteries with terminal diameters of 15-17 mm. Please measure your car battery pile head, then decide whether to buy the car battery disconnect switch. Electric Battery Isolator Switch Save your car's power, protect the entire system from draining. 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, allowing you to quickly disconnect your battery for safety, car maintenance, or storage. Easy to use, to open the power supply just tighten the green knob by hand and slightly loosen the green knob to disconnect. Battery master kill switch and immobilizer system for cars and trucks with "Top Post" type batteries. Especially for some older cars, the battery system is very fragile and will not restart if you leave them parked for a long time. Here is the remedy! Battery kill switch with universal terminals (cars,