Features: Made of high quality materials, durable and easy to use. Made of zinc alloy for long life and intended use: top posts, jambs, truck and marine battery terminals. Converting the side end batteries into top posts, each charging station comes with a hex nut that can be tightened with a wrench. Bottom positive (+) or negative (-) remarks; positive (+) diameter: 17-19mm; negative diameter (-): 15-17mm. These terminal charging stations are used to charge the side-charged batteries in the for cars, as well as to convert the side-charged batteries into the top-charged batteries in the for cars. These side battery charging posts only work with the wires on the car battery. They fit any type of powered sports battery. The battery terminals are suitable for standard positive and negative for car, boat, truck batteries, etc. Specifications: Material:Zinc Alloy Size: Approx.2.4x3.8cm/0.94x1.49inch Colour:Silver Thread dia:8mm/0.31Inch Thread length:10mm/0.39Inch Package Includes: 1x Positive Battery Terminal Connectors 1x Negative Battery Terminal Connectors note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.