... /2 3)Finish: blue zinc , white zinc plating ,chrome , nickel Insert nutFeature Material: Copper, high speed steel, carbon steel, alloy etc ... EDM, CNC grinding machine,CNC milling machine,polishing machine, engine lathe,Projector (imported from Japan),wire EDM machineAdvantageAccuracy: Inside diameter can ... order, please provide complete specifications and prints where possible. nut insert