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 and Plastic Quantity: 1 pc (Red cover or blue cover) Internal diameter (positive): 18mm or 0.7" Internal diameter (negative): 15.5mm or 5.9" Item Size: 6.9x4.7x2.8cm or 2.7x1.9x1.1" Net Weight: 0.155kg or 5.5oz Package Included: 1 pcx Battery Terminal (Red cover or blue cover)