The Micro 100 16R689 is a 1/4" diameter, 4 flute, carbide thread mill with a TiAlN coating. It has a right hand spiral flute and can cut 60 degree threads from 10-32 UNF to 5/16-18 UNC. The overall length is 2-1/2" and it has a 1/2" shank. This thread mill is made in the USA and can machine a variety of materials including steel, stainless steel, cast iron, aluminum, brass, bronze, plastics and more. It features Micro 100's proprietary TiAlN coating for increased tool life and improved performance. The 16R689 thread mill is well-suited for production threading applications.