Great product and very good quality. Made from M35 Hight-speed Steel .The surface was black oxide,Size:M12 X 1.75mm
Used to make new threads or re-thread damaged or jammed threads.Spiral groove taps have a longer service life than ordinary straight groove taps and can be used repeatedly.
Spiral Flute design, well chip removal, Easy tapping.With spiral flute taps, it is not necessary to repeatedly advance and retreat the taps and chips during tapping, which effectively improves the tapping efficiency; because the chips are unobstructed, the chips will not be blocked in the narrow flutes.