Pack of 10 Premium Black and Gold 5mm Jobber Length Drill Bits. Ideal for metal drilling and have exceptional durability drilling wood. Special Hi- Molybdenum tool steel with 135 Degree split points for fast penetration and accurate starting without a center punch. Precision ground point, flutes, body, clearance and drill diameter for the ultimate in accuracy and performance. Body and clearance are gold surface treated for maximum lubricity. Drills are heat treated to 2185 F and then nitro-carburize finished at 950 F to be measurable harder than High Speed Steel. Space age nitro-carburize steel withstands substantially higher drilling temperatures while maintaining sharpness. Recommended for use in work hardening grades of stainless steel and other hard metal drilling applications.