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Six aircraft quality precision twist drill bits for the most popular rivet and machine screw diameters: 3/32" long; 1/8" long, short and stub; 5/32" short; & 3/16" short. All TightFit® drill bits are black oxided to prevent corrosion and enhance appearance. The drill bits comply with National Aerospace Standards. The Standard provides the following description, "A special short flute, heavy duty drill designed for drilling the hard, high strength alloys used in aircraft manufacturing." The drill bits are made from M7 tool steel with self-centering, 135 degree, P3 split points and a Rockwell C scale hardness of 63.5 to 66. They are manufactured as right-hand tools with 5/16" hex wrench flats and 1/4-28 threads. TightFit® drill bits are concentric, self-tightening, non-slipping, long life tools designed for work in limited space situations. TightFit® drill bits WORK EQUALLY WELL IN METAL, WOOD OR PLASTIC. Note: Individual threaded TightFit® drill bits can be purchased by going to our website at www.TightFitTools.com

• Threaded TightFit® drill bits are made of M7 high-speed steel, for drilling hard, tough materials.
• With a 135 degree split-point, 1/4-28 threaded shank and a 5/16" hex adapter for easy removal.
• Three lengths of drill bits: LONGS=2 3/8";SHORTS=1 1/2"; and STUBS=3/4-7/8".
• TightFit® drill bits are black oxided to prevent corrosion while enhancing appearance.
• These drill bits comply with National Aerospace Standard NAS965.

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