The Lenox Tools 1211110DGDS Diamond Grit D/S-10DG 5/8 15.9MM Drill Bit is designed for drilling holes in Porcelain, Ceramic, Slate, Granite, Glass and many other tough and delicate surfaces. The bit features a brazed diamond edge that lasts longer in tile and stone. You get fast and easy cutting and it requires low torque and little pressure to get the job done. The hole saw also allows for easy plug removal.