For towing and maintenance, CURT wheel chocks are the perfect accessory to keep on hand. Any time you get underneath your car or truck to change oil, perform maintenance or make repairs, chocking the wheels is a vital safety measure. Even if you are just going under the hood to check fluid levels, it is a good idea to make sure your vehicle is not going anywhere. Likewise, whenever your vehicle is hitched up to a trailer and parked for an extended period of time -- whether it be at the campground or the boat landing -- using wheel chocks ensures your towing rig will not be rolling away without you in the driver seat. To ensure safety, a vehicles parking brake should not be the only thing to keep the weight of the vehicle and trailer in place, especially if they are parked on any kind of incline. CURT wheel chocks are designed to be used together with the emergency brake to stop your vehicle from moving. They are constructed from durable plastic and offer a generous 17" width. This allows them to be used with a variety of wheel and vehicle sizes, though they should never be used for commercial applications. CURT wheel chocks also feature a raised tread to better grip the wheel and saw-tooth edges on the base for better traction on the ground.