Features: High quality of plastic cover,  iron screw and nut, sturdy and durable, can use for a long time. quick release car battery connectors. Red cover connect with positive port and blue cover connect negative port. cable is fixed by a set screw. Suitable for all post round batteries size. Specifications: Type: Battery Terminals Material: Metal + Plastic Quantity: 1 pc (Red cover or blue cover) Internal diameter (positive): 18mm / 0.7" Internal diameter (negative): 15.5mm / 5.9" Item Size: 6.9*4.7*2.8cm / 2.7*1.9*1.1" Net Weight: 0.155kg / 5.5oz Package Included: 1 pc* Battery Terminal (Red cover or blue cover)