Easy to install: All standard 50mm tow ball can be installed by simply pressing the tow ball cover, the tow ball cover prevents damage. STURDY AND DURABLE: Made of weather-resistant plastic, your car's trailer hitch will be protected from the elements and the cover is even safe for car washes. Easy to use: Simply slide over the included strap loops and open the lid over the drag ball. The trailer ball cover is easy to remove and the hook prevents you from losing it. Compatibility: Designed to fit a standard 50mm trailer hitch ball, suitable for most vehicles. Wide range of applications: suitable for all conventional automobile tow bars, trucks, caravans, container trucks, trailers, cars and boats. Specification: Product Name: RV Trailer Hitch Ball Cover Material: Plastic Item Type: Drawbar Cap Color: Black Size: 50mm x 70mm (L x H)