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Point tap (long shank for deep holes) (EX-LT-DH-POT)[x]close
Most long shank taps have a thick shank part, so the maximum thread thickness of about 25 mm is the limit, but for this type it can be threaded to about 50 mm thick. There are few manufacturers making this type of type, so it was very helpful to find them. Sharpness is also good as well as other OSGs.
I thought that I wanted to use it for a penetrating tap with a depth of 30 mm and purchased it. Since there was 60 mm under the neck, I felt like to break when used on a machine, so I used it as a hand tap. I thought that I would like more kinds of head length down the neck.