The Micro 100 1/4" Shank Threading Tool is a high speed steel threading tool with a 1/4" shank diameter. It has a 60 degree threading point and can cut unified coarse, unified fine, and metric threads. The overall length is 3-1/2" and it has a 5/16" minor diameter. This threading tool is made in the USA out of C2 grade high speed steel for good wear resistance. It can machine steels, cast iron, aluminum, plastics, and other materials.