These are high performance, close tolerance, tight runout spec. tools designed for drilling with Bridgeport style or other production machines with 3/4" chucks.

Special Hi-Molybdenum tool steel. 135° split point for fast penetration and accurate starting without center punch. Precision ground point, body and drill diameter for the ultimate in accuracy and performance. Body and margin are gold surface treated for maximum lubricity. Heat treated at 2185° F and then nitro-carburize finished at 950° F to be measurably harder than high speed steel. Space age nitro-carburized 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.