Primary Wheel Chock Application Fire Trucks Width 11 1/4 in Height 12 1/4 in Depth 21 in Urethane Wheel Chock Surface Tread Grooved Wheel Chock Style Single Max Vehicle Weight 150 000 lb Wheel Chock Yellow Standards NFPA 1901-1909 SAE-J348 Includes Carrying Handle and Aluminum Cleats Max Tire Diameter 46 in Wheel Chock Base Tread Serrated