●These taps are made from high quality bearing steel for high hardness, durable and long service life ●There are total 7 pieces of taps in different sizes from M3 to M12 that you can use for tapping various threads ●They are used to cut new threads or repair damaged threads, you will have a smooth tapping experience with them ●These taps are used with a tap wrench to do the tapping, wrench is not included ●Great tools used to create screw threads on wood, plastic, aluminum or many other soft materials