The Micro 100 16R771 is a carbide thread mill with a 1/4" shank diameter, 1/2" max cutting diameter, and 1-1/2" overall length. It has a 60 degree thread angle and can cut unified coarse threads from 4 to 56 TPI in steel, stainless steel, cast iron, aluminum, and other materials. The carbide construction provides wear resistance and tool life. This thread mill is made in the USA by Micro 100, a manufacturer of indexable tooling, solid carbide tools, and other precision cutting tools. The 16R771 thread mill is well-suited for production threading applications.