PW4F P5™ General Purpose Turbo Cup WheelCoarse. Turbo design for fast, smooth grinding. Extra long life. Designed to be used on a variety of materials. Wet or dry grinding. Application: For Granite, Marble, Concrete, Brick, Block, Natural Stone, Refractory Material, Soft Stone, Sand Stone. 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