UC1600 SERIES GENERAL PURPOSE WHEEL CHOCKS for ground vehicles are manufactured with highly durable, lightweight polyurethane and are 3rd party tested, certified, and trusted by fleets globally. These chocks are ideal for use with over-the-road trucks, trailers, pickups, and utility vehicles. Rated for vehicles with tire sizes up to 35 in. (88.9 cm) diameter, and gross vehicle operating weight up to 40,000 lbs. (18,182 kg).