PW4MHPRF Pearl P4™ Granite Turbo Cup WheelCoarse. Turbo design for fast, smooth grinding. Extra long life. Designed to grind granite and other natural stone. Wet or dry grinding. Application: For Granite, Marble, Natural Stone, Artificial Stone, Soft Stone, Hard Brick. Max RPM: 13,700. Prop 65 Warning: This product can expose you to chemicals including Cobalt, which is known in the state of California to cause cancer, and Lead, which is known to the State of California to cause birth defects