282855 Disston Company 282855 Master Mechanic, 3/8 x 3-1/4, Glass Tile, Carbide Tipped Drill Bit, Standard Shank, Spear Pointed Tip Reduces Breakouts When Drilling From 1 Side To The Other, May Be Used With Any 3/8 Drill Press Or Variable Speed Drill, Zinc Finish, Recommended For Use In Ceramic Tile, Mirrors Or Glass Of All Types, Marble, Tile, Vitrolite China, Carded.