Specification: Car battery terminal, 12V/24V current, length: 54mm, bolt length: 30mm, Head width: 21mm, positive dia: 19mm, negative dia: 17mm Brass material: The car battery terminals are made of high quality thick brass, good electrical conductivity, wear resistance, corrosion resistance, high hardness, far from rust, good electrical connection Perfect connection: The shape of the interior of the car battery terminals is a light cone, to firmly grip the battery rod, smooth contact surface, reducing the risk of loosening Wing nut: 12v car battery is with a wing nut and can be tightened on the connected cable, easy and quick to install and disassemble, no need for a wrench Uses: Car battery terminal, Boat, van battery, a great replacement for old and unsuitable battery terminals, with red and black marks, + and —, no more mistakes A. Warm Tips: 1. Clean the battery terminal and car cable surface with steel wool to get a shiny metal surface 2. It is recommended to spray all