O45MT Milling Insert CHAMMILL octagonal indexable milling inserts for 45 facing. Part of the CHAMELEON multifunction line. Designation: O45MT 050505-RM. 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.