'Thread Mill, Helical, Internal or External, 9/16, Thread Size 9/16 In.-16, Pitch 16 TPI, End Mill Material Carbide, Flutes 4, Length of Cut 1.0880 In., Overall Length 3-1/2 In., Polished, Shank Dia. 1/2 In., Thread Type UN, Nomenclature TM, For Use With -, Application All Types of Metals, Composites and Tough-to-Machine Materials'