【6 Sizes】There are 6 different sizes of taps, from M3 to M10, for tapping different threads. 【Steel Material】This drill bit set is made of high speed steel and finished with nitriding for high hardness and rust resistance. The center drill bit has sufficient bending strength and wear resistance.【Drilling Function】This tap set features a spiral flute design for better chip evacuation. These are taps with drilling capabilities that allow you to drill and cut new threads while giving you a smooth tapping experience. 【High Efficiency】These HSS drill and tap bits are excellent tools used to create screw threads, to cut or form the female part of the mating pair, generally more accurate as human error is eliminated. They are used on a machine to perform tapping, such as a lathe. greep【Widely Applied】These small drill bit sets are used on a machine to perform tapping, generally more accurate as human error is eliminated. This tap drill bit set is suitable for drilling, tapping, cutting soft