Cyclone Ultra Cup Wheel - MEDIUM - 50 grit. Medium diamond grit allows a chip-free grind on porcelain, marble and troublesome granite. Fiber backing absorbs vibration to reduce chipping. Great for prepping seam joints, miter clean up or a beveled edge profile. Light weight design allows for usage on pneumatic polishers. Can be run wet or dry. 5/8” - 11 Fitting. 3,200 - 6,500 Max RPM.