Manufactured from premium High Speed steel for drilling in a wide variety of materials including aluminum, steels and stainless steel, QC41P screw machine drills have a bright finish to prevent workpiece material from sticking to the cutting surfaces of the drill for a cleaner more accurate hole.QC41P HSS BRT QC 135D Stub Drill Short ANSI N25 N25, 12PK QC41P screw machine drills are available in both fractional and wire gauge diameters..