KnKut 3/8" Reduced Shank Jobber Length Drills out perform high speed drills and even cobalt drills in many applications. KnKut Drills are manufactured from a high grade Molbydenum High Speed Steel (HSS), that has a high Vanadium content. KnKut Performance Drills are salt nitride treated, actually penetrating the tool's surface giving them the hardness to drill tough materials such as stainless steel and titanium alloy.