Thread taps are forged from high-speed steel with high strength and Good for general purpose applications The spiral flute designsmooth chip removal, breakage and allowing for more tapping Suitable for use with tapping machines for precision threading in a variety of materials Applications - Metric manual taps are primarily used in conjunction with a tap wrench and are suitable for retapping damaged or seized threads, or for forming new threads. They can be used for drilling and tapping holes in stainless steel, aluminum, alloy steel, mild steel, cast iron, non-ferrous metals, and other materials., Manufacturer: WENYAZIGUO