The Micro 100 Threading Tool is a high-speed steel threading tool with a 5/16" shank diameter and 60 degree included angle. It has a 0.040" minimum minor diameter and can cut up to 8 threads per inch. This single-point threading tool allows both external and internal threading operations. It features TiN coating for increased tool life and lubricity. The overall length is 3-1/2". This threading tool is made in the USA by Micro 100 and can machine a variety of materials including steel, stainless steel, cast iron, aluminum, brass, bronze, plastics and more. It's a versatile threading tool well-suited for lathes, screw machines, and CNC machines.