Kutzall Original Contour Wheels - 2-1/2" (63.5mm) Diameter, 3/8" (9.5mm) Bore, Tungsten Carbide Coating, Coarse - CW212O390 Rapid Material Removal - Saving you time and effort. Tungsten Carbide Teeth - Giving you outstanding wear-life. Comfortable, effortless operation. Leaves a relatively smooth finish. 1/4" Shaft Adapter Included