CTD US Magnum Super Premium 5/16" Mechanics Length Drill Bit Part # 87080 Length= 4" Flute Length= 2 1/2" Magnum Super Premium 3-Flats on Shank - 135 Split Point Special Hi-Molybdenum tool steel. 135 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 2185F and then nitro-carburize finished at 950F to be measurably harder than high speed steel. Nitro-carburized steel withstands substantially higher drilling temperatures while maintaining sharpness. Especially designed for hand held drills. Flats on shanks give positive chuck-grip (3/16 and larger). Recommended for use in work hardening grades of stainless steel and other hard metal drilling applications.
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