This drill is a Type 190-AG crafted from a special Hi-Molybdernum tool steel. 135 degrees split point for fast penetration and accurate starting without 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. Heat treated at 2185 degreesF and then nitro-carbuize finished at 950 degreesF to be measurably harder than high speed steel. Space age nitry-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. Sizes smaller than #52 have non-split points.
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