15 Piece, Cobalt Pro Drill Bit Set, 1/16" Through 3/8", 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, Rugged Storage Case With Rubber Over Mold For Added Impact Resistance & Sliding Latch Design Provides Added Security.