Vitrex Dry Diamond Drill Bit Kit - 6mm, 7mm and 8mm plus arbor | Vitrex
DaduoRi 5/16 inch Diamond Drill Bit with Quick Change Hex Shank, Used with Water, 5/16 Hole Saw for Porcelain Tile Glass Granite Ceramic Marble Stone, 8mm * 2pcs - Amazon.com
Amazon.com: Luomorgo 12Pcs 8mm/5/16 inch Diamond Hole Saw, 1-1/4 inch Cutting depth Diamond Diamond Drill Bits for Glass Ceramic Marble Porcelain Tile Granite Quartz Gemstone : Tools & Home Improvement