Features 1、SPIRAL TAP SET: Adopt High speed steel material with blue coating, long lasting and wear resistant. Suitable for through holes and blind holes, with strong cutting performance 2、HARD AND HEAT RESISTANT: Thread tap drill bits possess long service life, high hardness, fast chip removal, and high temperature resistance 3、VERSATILE FOR VARIOUS MATERIALS: Spiral flute screw machine tap is suitable for processing iron, aluminum, and universal steel materials, very versatile 4、RELIABLE MATERIAL: Metal screw hole tap drill is made of high speed steel for superior performance, has high toughness and good wear resistance 5、MULTIPLE SIZES INCLUDED: Thread tap drill bits set include various sizes ranging from 6‑32NC to 1/4‑20NC for different needs, provide great convenience for your work Specification Item Type: Thread Tap Drill Bits Material: High speed steel Specification: 6-32NC 8-32NC 10-24NC 10-32NC 12-24NC 1/4-20NC Package List 6 x Screw Taps