Mounted Mushroom Buffs are designed to get into hard to reach areas that might not be accessible with standard buffing wheels. The faces of these buffs are a mushroom like shape which is ideal for polishing contoured shapes. Mounted on a 1/4" shank, the buff can be used with any standard electric drill. Keep speeds below 10,000 RPM (much lower is better) and always use a polishing compound, like Nuvite.