29 Piece Cobalt M-42 Metal Index Drill Bit Set Cobalt steel extends cutting edge life and maintains cutting life after resharpening. Extra hard drill for greater wear. 135° split point tip starts on contact, cuts with less force. Reduced shank above 3/8” allows the use of larger drill bits in a 3/8” chuck. Rubber overmolded case protects kit if dropped. Tap & Drill selection chart for convenient reference. . Automatic indexing for easy bit access and identification . Removable cartridges: easy to carry bits from case to worksite . Sizes include 1/16” to 1/2” in 1/64” increments 3018002B