DAMO 2 inch Dry Diamond Polishing Drum Wheels Set of 7 PCS for Granite Marble Concrete Sink Cutouts 1 of each grit 50,100,200,400,800,1500 and 3000; 5/8"-11 female threads,2" in diameter and 1-5/8" in height; Dry use only; Vertical oscillation recommended for even wear; Maximum speed 4,000RPM.