spiral grooves 40°, HSS-E, TiN coating, metric ISO-thread, right thread, Tolerance field ISO2 / 6H, forme of taper lead C (2-3 x P), cylinder shank with square piece, number of teeth 2-4 Power class N For long-chipping materials with a tensile strength of Rm > 350...1000 N/mm2. Length of taper lead: 2.5 x P Hole Type: pocket holes < 2.5 x d. Designs: M2...M10: N360TN-3, reinforced shaft, DIN 371 M12...M20: N460TN-3, falling through shaft, DIN 376