Hyper Tough Super Wheel Chock Big Size, For Use With Tires up tp 29in RV wheel chock 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 to use and effective. Makes stabilizing and centering wheels easier Helps eliminate dangerous wheel movementSized for larger vehicle wheels Ideal for RVs, trucks and trailersCAUTION: Always use brake, Never place yourself under or behind unstable vehicles. Prolong exposure to sunlight can cause chock to weaken.