DAMO 2 inch Wet Diamond Polishing Drum Wheel Grit 400 for Granite Marble Concrete Sink Cutouts Grit 400; 5/8"-11 female threads,2" in diameter and 1-5/8" in height; With vents and fits on water-fed polishers, Wet use only; Vertical oscillation recommended for even wear; Maximum speed 4,000RPM.