Features 1、Screw tap's flute keeps cobalt-containing 5% for high strength, meanwhile cobalt-containing high-speed steel enables to significantly improve the wear resistance and cutting performance of steel. 2、High practicality helps screw tap keeps wide range of application, durable and wear resistance. 3、Meanwhile, this spiral tap is with the ability to process stainless steel and other difficult-to-machine metals. 4、And such hand tool is suitable for processing stainless steel, steel plate, copper, MK80 alloy steel, die steel, iron alloy and other metals. 5、Pat the debris into a spiral shape to discharge the chips upwards, which is more suitable for processing into blind holes and viscous material processing. Specification Item Type: Screw tap Material: High speed steel Color: Gold silver Size: Tap M3 Flute Diameter: Approx. 3mm / 0.12in , Flute Length: Approx. 13mm / 0.51in, Shank Diameter: Approx. 2mm / 0.08in, Total Length: Approx. 51mm / 2.01in Tap M4 Flute Diameter: Approx. 4mm / 0.16in, Flute Length: Approx. 18mm / 0.71in, Shank Diameter: Approx. 3mm / 0.12in, Total Length: Approx. 57mm / 2.24in Applicable: Suitable for processing stainless steel, steel plate, copper, MK80 alloy steel, die steel, iron alloy and other metals. Package List 3 x Spiral Tap M3 3 x Spiral Tap M4