Features: 1.Made of heavy duty solid brass, corrosion resistant, no easy to rust and durable made for safety use. 2.Vertical knife blade type, has good conduct ability and strong anti?decays ability. 3.Can only conncect to negative post only, can disconnect the battery safely, minimize battery loss and prevent effective leakage. 4.Easy to install and use, used for GM side post batteries or other batteries to isolate and secure the electrical system. 5.Suitable for Pick?up, Car, RV, UTV, Ship,etc, owns simple structure, stable quality and high efficiency. Specification: Item Type: Battery Disconnect Switch Material: Brass Color: Gold+Black Working Current: 250A Intermittent Rated Current: 400 Amps DC Cranking Rated Current: 750 Amps DC Voltage Rated Current: 12V/24V Operation:On/Off Battery Negative Pole Inner Diameter: Approx. 15.5-17mm/0.6-0.7in Note: Please allow 1?3mm difference due to manual measurement.