Battery Knife Switch for Negative Post: Applicable to the battery negative diameter of 15-17mm 12V / 24V car battery. Widely used for car, vehicle, RV, ATV and boat batteries, also used for electrical equipment. Vertical knife blade type. Car Battery Master Disconnect Switch: To prevent the battery power is consumed by the car, to facilitate temporary power off during vehicle maintenance. Extend the life of the car battery head. Material: Car battery power switch is made of brass with electroplated surface, corrosion resistance, good conductivity. The maximum current up to 800A, rated current of 150A. Simply lift the knife and then power is cut. Battery knife switch prevents shorts and fires when working on electrical systemsEasy to Install : Can be adjusted by the bottom of the screw, into a vertical knife switch, or horizontal knife switch. Material: Brass, PVC Maximum Current: 750A Rated Current: 250 Dimension: 3.7*2.6*1.85inches/94*66*47mm Pole Diameter: 0.6inchesProducts from He Wei's store