Product Description Material: Zinc Alloy Color: silve 0/4/8/10 AWG instrument input: there are four different sizes of wiring outlets Positive and negative terminals: the positive and negative terminals are clearly marked with (+) positive or (-) negative for easy polarity identification Quantity: 1pairs Positive inner diameter: 18mm, negative inner diameter: 16mm; Package content: 1*a pair of car battery heads .Premium Battery Terminal Made of Zinc Alloy material with excellent signal transfer, high electrical conductivity and corrosion-resistance. Positive and Negative terminal connector is Clearly Marked for easy identification. .Easy InstallationThere are four different sizes of a wiring outlet: 0/4/8/10 AWG Gauge Inputs. The clamps are designed to hook up multiple cable securely in place. Easy to modify the wiring, Fast and easy installation. High-value AccessoriesOffering 2 pcs adjustable spacer shims for More Fexible Connection when the Tapering Post is not Large enough.The clear cover can be waterproof and dustproof, prolonging the battery lifetime. Wire lugs are made from Annealed Electrolytic Grade Copper for max conductivity. .Universal ApplicationSuitable for Most Models Battery. Works well in solar panels, distribution box, marine, golf carts, vehicle, motorcycle, boat, trolling motors wiring, other outdoor applications and home applications, etc.