Features: You can directly replace your previous damaged parts, improve the efficiency of the car. Main function: connecting truck and power supply, suitable for trailer signal display. Simple push on tow ball cover to fit all standard 50mm tow balls. Helps keep your tow ball free of dirt and rust. Helps to maintain grease on tow ball when used with a standard hitch. Package Includes: 1x Tow Ball Cover Specifications: Material:PVC Diameter: Approx.5cm/1.96inch Color:Black/Blue/Red/Yellow 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.