Stop trailer or vehicle tires from rolling! Made from durable molded poly material that's lightweight and weatherproof. Non-skid base helps prevent slippage. Great for use with Rhino Ramps #77478 or Trolley Jack #76830 (both sold separately). Chocks nest for compact storage. Each chock is 9"L x 6"H x 5"W. | Hopkins Manufacturing Heavy-Duty Wheel Chocks, Set of 2