Fractional Jobber Length Drill Bit Set, 1/16-1/2" by 32nds, 15pc Premium grade KnKut Drills are manufactured from a high grade M-7 Molybdenum high speed steel, that has a high vanadium content.. KnKut Performance Drills are salt nitride treated, actually penetrating the tool's surface giving KnKut Drills the hardness to drill tough materials such as stainless steel and titanium alloy.. The advantages of KnKut Performance Drills include:. No center punch or pilot hole required. Rounder, more accurate holes. 50% more holes. Lowest cost per hole. Faster penetration. Drills tough alloys. Reduces user fatigue. Added strength against breakage 15KK5 Prop65 information pending -