"Keep heavy vehicles parked safely in place with this durable polyurethane wheel chock. These heavy-duty chocks can support a vehicle with a gross operating rate of 70-tons, and are rated for tires up to 65"" in diameter. The large base makes these wheel chocks ideal for use with heavy equipment, semi- trucks, and other large ground vehicles. Featuring a recessed handle, these chocks are easy to carry, maneuver and set up. Optional brackets are available for mounting chocks on your vehicle."