OTC Tools 8330 Resurfacing Grinder The aggressive design of the grinding pad scours through burned in corrosion, flaking paint, dirt, and other debris Excellent for resurfacing stud less wheel surfaces common to many European vehicles, wheel centers, or any flat surface needing a good cleaning Use before replacing wheels, or before re-alignment to reduce lateral run out Use to ensure wheels are properly fit to hubs and rotors are properly fit to wheels Average cleaning process time per hub is only 3 to 25 seconds, depending on residue thickness