These valves are high speed steel with nitriding surface treatment to achieve high hardness and rust resistance. From M3 to M10 there are 6 taps in different sizes, which you can use to tap different threads. The faucet is designed with spiral groove, and the chip cleaning process will be better. These are taps with drilling function, which are used for punching and cutting new threads at the same time. You will get very smooth tapping experience. These taps are used for taps on machines and are generally more accurate because they eliminate human error. Description: The tapping drill allows one-pass drilling and tapping, which improves work efficiency. These HSS bits and taps are excellent tools for forming threads, cutting or forming female molds for matching pairs of threads. They are used for tapping on machines such as lathes. Because human error is eliminated, automatic tapping using these taps is faster and generally more accurate. Features: These valves are made of high speed steel with nitriding surface treatment, high hardness and corrosion resistance. From M3 to M10 there are 6 taps in different sizes, which you can use to tap different threads. The taps are designed with spiral grooves, so the chip cleaning process will be better. These are taps with drilling function, used to punch and cut new threads at the same time, you will get very smooth tapping experience. These taps are used on machine taps and are generally more accurate as they eliminate human error. Specifications: Material: high speed steel (titanium coating) Color: as shown in picture Hex handle: 6.35 mm (1\/4 \