Master Mechanic, 4 Piece, Glass & Tile Carbide Tipped Drill Bit Set, Includes 1/8", 1/4", 3/16" & 5/16" Drill Bits, 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.