Diamond & CBN centerless wheels are for TCT cutting tools,bearing parts, automobile parts, plungers, cylinders and engine valves. Our Centerless wheels are divided into two types: Roughing and Finishing . The finest diamond grit used for centerless Finishing wheel can be 2000mesh, to provide mirror polishing result. Max OD: 500mm (20") Max Thickness: 250mm (10") The cores available: Alumina and Bakelite. (Bakelite core is elastic and light weighed. It provides higher surface finishing and lessen the machine load. )