Metric Spiral Point Taps: Thread size: M2 x 0.4, M2.5 x 0.45, M3 x 0.5, M3.5 x 0.6, M4 x 0.7, M5 x 0.8, M6 x 1.0; plug chamfer and right hand thread cutting. Straight flutes are ground to provide provide downward chip removal, with clear threads and sharp cutting edges. Material & Finish: 6542 (M2) high speed steel metric taps run at high speeds and generate threads quickly and efficiently, offering high hardness (HRC62-64), wear resistance, and good toughness. Titanium coating for improving wear resistance, hardness, heat resistance, lubricity. Applications: Thread taps are great for through-hole threads. Can be used for drilling and tapping stainless steel, aluminum, alloy steel, ordinary steel, cast iron, non-ferrous metals, hard plastics, etc. Flutes on the screw tap help to remove chips and debris from the hole. Machine Tap: Suitable for drill presses, tapping machines, CNC and milling machines. Used with tapping oil to get higher quality threads and more durable taps. Tips: Machine taps are suggested to be used with tap chucks with overload protection. It is not recommended for hand use and electric drill tapping. Drill the holes with a twist drill bit first, then tap with a thread tap. Color:Silver & Gold Material:Steel Package Contents: 7 * Spiral Point Tap Set