Dry Diamond Drill Bits Set 6PCS, Porcelain Drill Bits with Cooling Wax for Ceramic Granite Marble Tile Stone Glass Hard Materials (not for Wood), 3pcs 1/4''(6mm)+3pcs 3/16'' (5mm) with Storage Case -
10 Pack Diamond Drill Bit Set, 6mm (1/4inch) Small Diamond Hole Saw Kit for Glass, Ceramics, Porcelain, Ceramic Tile, Marble - Amazon.com