HBR-QF Milling Inserts BALLPLUS, 2 cutting edges (fully effective), 220 spherical cutting profile inserts. Used for profiling, up and down ramping, steep profiles and undercutting. Accuracy is within 0.01mm. May be used for roughing or finishing applications. Insert Grade: IC328 ISO Range - P/M/K: (P25-P40)(M30-M40) ISO Range - H/S/N: (S20-S30) Grade or Coating Type: PVD Coating Layers: TiCN A thin PVD coated TiCN layer on a P45-K40 substrate. Very high toughness. For milling, parting and grooving of steel, stainless and alloy steels at low to medium cutting speeds and for unstable machining conditions.