Wheel Chock - The Camco Standard Wheel Chock is great for helping to stop unwanted trailer movement and keep your vehicle from rolling away when on any kind of an incline. They also help keep your trailer in place so you can re-hitch easily. Also, you can use it on the opposite side when changing tires on cars, light trucks, vans and trailers to help stabilize the wheel from moving. Made of durable hard plastic with UV inhibitors and a yellow color to help you spot it when getting ready to move. Yellow in color. Dimensions: 4.56 inch H x 4.87 inch W x 8.75 inch L. 1 per package.