Harvey Tool 724230-C6 | M6 Thread x 4.800mm Cutter Diameter x 20.000mm Reach 5 Flute C6 Coated Thread Milling CutterFeatures Designed for threading hardened steels 48 68Rc Single thread form designed to mill common pitch sizes Cuts internal and external 60 Degree metric threads Tip of included angle ground to a flat for increased wear resistance Large rigid core diameter and eccentric relief for improved strength Mills left hand and right hand threads h6 shank tolerance for high precision tool holders Latest generation AlTiN Nano coating offers superior hardness