1. Use: grinding wheel for machining of glass: glass thickness, jade, jade, , and other building materials. 2. the correct use method: electric drill speed 3600 rpm, bench drill and machine speed in 6000 ~ 10000. The water must be polished so as to achieve the best effect. 3. About how to choose the explanation: if the material thickness of 8mm, choose the appropriate 8mm grinding wheel., Weight: 0.04960400895 Pounds, Manufacturer: Jaywool