Most of the so long shank tap is made thicker shank portion is threaded much maximum thickness of 25mm is the limit, threaded possible until about this type if the thickness of 50mm. The manufacturer is less that are making this type of shape, it was very helpful can be found. Sharpness as well other OSG, is pretty good.
I purchased I would like to use the through-tap of depth 30mm. Because under the neck was felt likely to break when used in the machine because there is also a 60mm, it was used as a hand tap. I thought that the length of the lower neck I want to increase the more kind.
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