1/16 – 1/2 Cobalt 135° Split Point 29 Piece Jobber Drill Set. 29 Piece Drill Set (Jobber Length & Screw Machine). Precision CNC machined for accuracy, improved chip evacuation and premium performance. Superior red hardness for high temperature applications. Engineered and manufactured for less end load pressure. Industrial-grade NAS Cobalt Steel (HSCO). Heavy duty metal storage case. Numbered metal tip-out indexes keep bit protected and organized. Material applications: aluminum, copper, cast iron, steel (low and medium carbon), steel alloy, stainless steel, strength alloys, plastic. Size Range 1/16 – 1/2.