The Checkersheavy-duty AT3512 wheel chocks for all-terrain ground vehicles are manufactured with highly durable, lightweight polyurethane and they feature replaceable aluminum base plates with posi-grip cleats or anti-slip rubber traction pads. AT3512 wheel chocks are ideal for underground mining equipment, firefighting vehicles, and large utility vehicles. For vehicles with tire sizes up to 38 in. 96.5 cm diameter and gross vehicle operating weight up to 80,000 lbs. 36,364 kg.