Polished Coating, Carbide insert for Steel and Stainless Steel machining with or without coolant , used in any suitable cutter for EMRW6R and this is used in milling machine mainly. Suitable cutter any cutter which suits RPMT1204 insert For steel , mild steel , hrc up to 45-55 with and without coolant , R6 for EMRW6R-CUTTER BODY