Camco's RV Super Wheel Chock is designed to keep your trailer in place so that you can re-hitch with confidence. It is constructed of durable hard plastic with UV inhibitors and is easy as well as effective to use. Keeps the trailer in place Durable hard plastic with UV inhibitors Measures 5.5" x 8.5" x 10" For use with tires up to 29" Made in the USA