ATV Universal Wheel Chock Motorcycle Bike Trailer Tire Adjustable 3.5" to 11.5" Rugged 1" Steel tubing with powder coating for rust resistance Keep your motorcycle or ATV safe and secure while trailering and make loading your machine quick and easy. Easily mount on your trailer and is quickly removed with quick release mounting plate. Can also be bolted in place for permanent installation. Includes: 4 tubes ( 1-1/2", 3-1/2", 4-1/2" and 10-1/2") allowing you to adjust the width from 3-1/2" to 11-1/2"