The CYCLONE TURBO CUP WHEEL by Diamax is designed for use on an angle ginder or pneumatic polisher. Grit: Coarse 30. Materials: Engineered stone, granite. WET only. Balanced to eliminate vibration and chipping when shaping. Aggressive design with thick turbo segments and diamond content. 5/8″-11 threaded. MAX RPM: 8,000. Fitting: 5/8″ – 11 thread, steel. WHL 4 TURBO CUP WHEEL 5/8-11 THREAD