QPSYYB 1inch Diamond Drum Wheel 25mm Sink Hole Grinding Polishing Tool M14 5/8"-11 Thread For Marble Granite Stone,0225. 1 inch/ 25mm ; Grit available: 50# 100# 200# 400# 800# 1500# 3000# ; Thread: M14 or 5/8\"-11 ; material: resin, diamond and aluminum ; Maximum speed: 4500 RPM ; Package: 1 x resin drum wheel. Diamond resin drum wheels design for wet polishing with water feeding holes, are widely used for polishing granite and marble countertop. With high quality of diamond. Does not change in the color of the stone itself. With glazing fast, good brightness and not fade. With water feeding holes, wet use only,Maximum speed 4500 RPM. Farbe:M14 thread