These end charging stations are used for charging side charged batteries in cars, as well as converting side charged batteries to top charged batteries in cars. Converting end batteries side in top posts, each charging station comes with a hex nut that can be tightened with a wrench. Wire diameter: 8mm; Wire length: 10mm; Positive remarks (+) or negative(-) or negative;Diameter positive (+): 17-19mm;Diameter negative (-): 15-17mm. These side battery charging poles only work with wires of the car battery. They match any type of powered sports battery. The battery terminals are suitable for standard positive and negative for batteries in cars, boats, trucks, etc. Made in high quality materials, durable and easy to use.Made of zinc alloy for long life life and intended use: Top Posts, Uprights, Trucks and Marine Battery Terminals.