Helical Mills Helical Mills • M390 Series End Cap • Four cutting edges per insert. • Replaceable end cap. • Positive helix for high productivity. End Cap order number catalogue number D1 L1 ZU Z kg 2021428 12393051200 50 21 3 6 0,2 2021429 12393051400 63 21 4 8 0,3 2021430 12393051800 80 21 5 10 0,5 NOTE: Z = number of pocket seats. ZU = number of effective teeth. widia.com K5