【High Efficiency】- This tapping bit improves work efficiency by allowing drilling and tapping at the same time. 【Main Function】- This spiral threaded tap is ideal for making threads, cutting, or forming a concave part of a mating pair. 【High Quality】- The threaded taps are made of high-speed steel and have a nitride surface for high hardness and rust resistance. 【M3 - M10】- This tapping bit has 6 different sizes, 6 different sizes of taps from M3 to M10 that can be used to connect a variety of threads. 【High Precision】- This tapping bit uses a spiral flute design that facilitates the chip cleaning process. These tapping bits are used for tapping, which is generally more precise because it eliminates human error. These HSS drills and taps are excellent tools used for creating threads, cutting, or forming the female part of a mating pair. They are used on a tapping machine, such as a lathe. Machine tapping with these bits is faster and generally more precise because it eliminates human