Since it is a pilot type, it is not necessary to separately perform thread cutting by an electric drill, and you can recoil slowly and surely manually. However, since the tip is preceded by M6, a penetrating space of about 1 cm after penetration is necessary. Since the attached insert was as long as 1.5 cm, I bought a 1.0 cm insert separately. Also, I purchased a tap handle separately. Virtually it is like the price of the item = pilot tap. Although the price is expensive, beginners have a sense of security since they are also difficult to fail.
Is it a monopoly or expensive? It's just a tap with pilot, so it can be repaired and useful without rounding the machine and attaching it to the fixture. Since the pilot part is too long and it hits in the back, I bought it separately for finishing. Pilot taps for replacement are also saved when sold separately at low price.