GUHRING 9039090180000 Sp Flute Tap, Mod Bottom, 18x2.50mm, TiN. More details: Spiral Flute Tap, Right Hand, Tap Style Modified Bottoming, Size M18, Pitch 2.50mm, Material Powdered Metal Cobalt, TiN Finish, Overall Length 102mm, Thread Length 28mm, Shank Dia. 13.70mm, Number of Flutes 4, Thread Type Metric Coarse, Pitch Diameter Limits D6, List Number 3909, Standards ANSI