The Micro 100 16R665 thread mill is a carbide thread milling cutter 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 thread milling. The 16R665 has a right-hand cut direction and is made in the USA by Micro 100, a leading manufacturer of high-performance cutting tools. This durable carbide thread mill is well-suited for production thread milling applications.