Specification: Length Of Chock: 17CM Width Of Chock: 12CM Height Of Chock: 11CM Overall Length: 19CM Width Of Metal: 10CM Safety Trailer Chocks When your vehicle is parked on uneven surfaces, it's recommended you chock the tyres. Our chocks are safely secured in place by the vehicles tyres on the hinged metal frame, this helps to avoid slippage and removal. The thick plastic groves provides good support, whilst the rigged surface offers grips to the tyres. They're easy to clean and suitable for motorhomes, caravans, trailers and cars.