"Black Widow ProLift Roller Plate lets allows the rear motorcycle wheel to smoothly spin when using the BW-PROLIFT-HD heavy-duty motorcycle or ATV lift table. Features 1.375"" diameter steel rollers with sealed ball bearings designed to spin freely under the wheel weight, making oiling the bike's chain and cleaning the rear tire rims easy. Constructed of heavy-duty steel with a thick orange paint finish. Ideal for cruisers and sport bikes, the Black Widow Roller Plate is solely compatible with the BW-PROLIFT-HD. Please note: This wheel roller is not designed for use as a dynamometer."