The Micro 100 16R735 is a carbide thread mill with a 1/2" shank diameter, 1-1/2" overall length, and 1/4"-28 internal thread size. It has a TiAlN coating for increased tool life and can machine a variety of materials including steel, stainless steel, cast iron, aluminum, and more. With its variable helix flutes, it provides efficient chip evacuation while milling. The Micro 100 thread mill is made in the USA and well-suited for production threading applications.