Resin bond CBN wheels are used for double-disc surface grinding of the inner and outer race surfaces of bearings, transmission gears, washers, tappet shims, compressor parts, vane pump vanes and rotors, precision springs, etc. These are applicable to a wide range of materials, such as high-speed tool steel, die steel, bearing steel, carbon tool steel, spring steel, cast iron, sintered ferrous metal, etc.