These battery terminals are made of copper, which has good conductivity, can reduce voltage distortion and transmission loss, and is corrosion-resistant. Includes 1 red positive battery terminal plug, 1 black negative battery terminal plug, 1 hex wrench, and 2 corrosion-resistant fiber gaskets for battery terminal blocks.The positive and negative terminals of the battery are clearly labeled and easy to identify. Equipped with an Allen wrench for easy installation and quick disassembly. Comes with a cleaning brush for removing dirt, sediment, and corrosive substances. After installing the battery, simply connect the handle to the battery terminal without the need for any tools.Suitable for wires with a diameter of 5.2-7.4 millimeters (AWG 1-4 gauge) or a cross-sectional area of 16-35 square millimeters. Minimum cable size: 16 millimeters (5/8 inches). Maximum clamp size: 9.5 millimeters/0.37 inches, minimum clamp size: 6.5 millimeters/0.25 inches. Positive electrode inner diameter: 17-18.2 millimeters, negative electrode inner diameter: 16-17.2 millimeters.The battery clip adopts a four-way connection design, which can achieve multiple connection methods. Easy wiring and secure connection.Suitable for SAE/JIS A-type round pole automotive batteries. Positive and negative terminal blocks can be used for cars, trucks, RVs, campers, truck batteries, car audio systems, etc.Copper