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18 Piece set. Fractional spiral point taps. Corresponding drill sizes are sized to the closest standard measurement. Special Hi-Molybdenum tool steel. 135° split point 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 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. Manufactured to NAS 907B specification. Precision ground tap threads for the ultimate in accuracy and performance. Spiral point taps are designed for machine tapping through holes in a wide variety of materials. The point of the tap continuously ejects the chips ahead of the tap, eliminating chip disposal problems and thread damage. Black surface treated threads for long life and rich appearance. Recommended for use in production tapping and drilling in work hardening grades of stainless steel and other hard metal applications. Type 190-AG drill bits and 20-AG taps. Made in USA.
Includes: 190-AG Drill Sizes: #36, 29, 25, 21, 7, F 20-AG Tap Sizes: 6-32, 8-32, 10-24, 10-32, 1/4-20 & 5/16-18