"About this article3 Way Negative Positive Battery Terminals with Material: Pure Copper Plate and Plastic. Being able to isolate connections is a great featureBattery positive terminal hole diameter: 0.71 inch (18 mm). Negative battery terminal hole diameter: 0.67 inch (17 mm).The battery cable end is suitable for 6/12 volt positive or negative battery plates.Area of use: Battery terminal connectors for cars, trucks, caravans, motorhomes, truck batteries, etc.2 colors of battery terminals to distinguish between positive and negative connectors, black, redProduct descriptionBattery terminal connectors Very well built, easy to add wires, perfect replacement for old worn and tired battery connectors.These made it very easy to cleanly wire everything. The wiring is convenient and the connection is firm.Durable and robustPremium zinc alloy material for excellent signal transfer and high electrical conductivity.Positive negativePositive battery terminal connector (18 mm) + negative battery terminal connector (17 mm).Clamping cablesConnect several cables together, the cables are held together with a screw and create a super connection."