Checkers Monster Industrial Wheel Chocks, the best-selling and most-used wheel chocks within the mining industry, are ideal for preventing heavy-duty equipment such as haul trucks, loaders, and cranes from accidentally moving or rolling downhill. Multiple versions are available for wheels up to 165" in diameter on vehicles weighing up to 800 tons.The lightweight, damage-resistant polyurethane construction will not corrode when exposed to oils, fuels, or other solvents. Each wheel chock features a recessed carrying handle molded right into its surface for easy set-up and transportation and comes with replaceable anti-slip rubber pads for enhanced underside traction on pavement and gravel. Holes in the sides of the chocks are designed to fit chains, ropes, or brackets to make hanging storage as simple as possible. For the most efficient storage solution, mount the wheel chocks directly onto your vehicle using this optional mounting bracket. All industrial wheel chocks are sold individually.