Cobalt Drill Bit Set. Sizes 1/16 inch -1/2 inch in 1/64 inch increments, 135 Degree Split Point To Minimize Walk. 5% Cobalt For Higher Heat & Abrasion Resistance. Heavy Duty Web Construction For Strength & Durability. The item “Irwin Tools 3018002 Cobalt M-35 Metal Index Drill Bit Set, 29 Piece” is in sale since Wednesday, May 16, 2018. This item is in the category “Home & Garden\Tools\Power Tools\Drill Bits”. The seller is “motogroupllc” and is located in Indianapolis, Indiana. This item can be shipped to United States.