Awclub Glass Drill Bit - 1/4-inch(6mm) Diamond Coated Hole Saw Drill Bits for Glass Ceramic Tile Marble Rock Porcelain 10Pcs - Yahoo Shopping
DaduoRi 1/4 inch 6mm Diamond Hole Saw with Quick Change Hex Shank, Use with Water, 1/4" Diamond Drill Bit for Porcelain Tile Glass Granite Ceramic Marble Stone, 2PCS - Amazon.com