Buyers Products Laminated Rubber Wheel Chock Fits Snugly Under Wheels To Keep Vehicles In Place While They Are Serviced Or Parked. Made With Recycled Tire Rubber Pressed Between Two, 1/4 In. Thick Steel Plates, The Rust And Chemical-Proof Chock Will Provide Years Of Use. It Includes A Retaining Bracket For Use With Chains.