The PRO-WHEEL MANDREL has several advantages over standard wheel mandrels. A CENTERING CONE is built into the screw assembly. This helps center the wheel in the tool providing a great work center for cutting, sanding or polishing your wheel. There is also a step cut in the body of the tool for mounting B.S.A. wheels in reverse for polishing the inner edge. The PRO-WHEEL MANDREL also has an easy grip screw that makes it easy to apply and remove without the use of tools.