Specification: Car Battery Terminal, 12V/24V Current, Length: 54mm, Bolt Length: 30mm, Head Width: 21mm, Positive Dia: 19mm, Negative Dia: 17mm Material made of brass: The car battery terminals are made of high quality thick brass, providing good electrical conductivity, wear resistance, corrosion resistance, high hardness, and resistance to rust, ensuring a reliable electrical connection Perfect connection: The interior shape of the car battery terminals is a light cone, designed to firmly grip the battery post with a smooth contact surface, reducing the risk of loosening Wing nut: 12V car battery terminal includes a wing nut that can be tightened on the connected cable, allowing for easy and quick installation and removal without the need for a wrench Uses: Battery terminal for car, boat, van battery; a great replacement for old or damaged battery terminals; includes red and black covers with "+" and "-" markings for correct polarity identification