Set includes: Diamond compound stick (white), tripoli compound stick (brown) emery compound stick (black). Maximum speed 4000rpm. Emery stick: Cutting compound for use on copper, brass, aluminium, steel, stainless steel, nickel & iron. Diamond Compound stick: Extra-fine dry compound for use on chromium, stainless steel, carbon steel, brass & aluminium. Tripoli compound stick: Cutting compound for use on copper, brass & aluminium. Round buff 75mm diameter; tapered buff 50mm x 50mm.