29 Piece, Cobalt Drill Bit Set, Sizes 1/16"-1/2" By 64ths, 135 Degree Split Point To Minimize Walk, 8% Cobalt For Higher Heat & Abrasion Resistance, Heavy Duty Web Construction For Strength & Durability, For Tough Metal Drilling, Including Heavy Duty Abrasive, Alloy Metal Drilling On Hardened Steel, Cast Iron, & Stainless Steel, Innovative Case Features Rubber Overmolding For Bit Protection, A Integrated Tap & Drill Selection Chart, Automatic Indexing & Removable Cartridges That Allow You To Easily Carry Bits From Case To Worksite, Carded.