Premium material: The battery pole is made of pure tinned copper, which has excellent conductivity and effectively reduces the loss of transmission power. It can be used for a long time and is not easy to be damaged. Package Contents: The battery terminals have two colors to distinguish positive and negative connections, black (-) and red (+). The battery positive hole diameter is 18mm. The battery negative hole diameter is 17mm. Practical Design: The battery pole adapter locking lock provides better fixing efficiency. Composed of 3 screws of 6 mm and 1 screw of 8 mm. Ergonomic design, solid construction for good performance and reliability. Lightweight and comfortable to wear. Easy to install: Battery terminal wiring is simple, quick and easy. Remove the battery terminal from the copper ring that needs to be replaced during the installation process, put the new car battery terminals on the positive and negative poles, and tighten the nuts to lock the fixed switch. Wide Application: Battery terminal for 6/12V positive or negative battery plates. Used to securely connect multiple cables. Battery terminals are suitable for all types of cars, trucks, caravans, boats, ATVs, RV batteries, etc.