The Micro 100 16R676 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 1/4" shank. This thread mill is made in the USA out of micrograin carbide and has AlTiN coating for wear resistance when cutting steel, stainless steel, cast iron, aluminum and other materials. It can be run at speeds up to 2000 SFM.