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.