MONSTER® UC1400 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 32 in. (81.3 cm) diameter and gross vehicle operating weight up to 60,000 lbs. (27,215 kg).