Features: Manufacturing process: the main components of the battery head are made of copper. The screw and nut accessories are not copper. Suitable for most vehicles with copper conductive properties, good flexibility, pile head does not break, anti-corrosion Material: copper Specifications: positive internal diameter: 19mm, negative internal diameter: 17mm; Product manual 1, the product is made of copper die casting, good manufacturing materials make the product last longer than normal alloy products, functional performance. 2, copper materials in possession of plasticity with good electrical conductivity, can reduce the voltage distortion, reduce the loss of current transmission. 3, with corrosion resistance, good conductivity, easy wiring, etc. 4, the connection is firm. Packing list: 2 * battery terminal (1 pair)