Titan Titanium Coated Drill Bit - 22 Piece with Case features 21 titanium coated high speed steel drill bit set and convenient storage case. It has titanium nitride coating that extends the life of the bit up to six times longer. The standard high speed steel drill bits contains: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8 inches.