... treatment: plain7. professional manufactuer, offers better quality and price Productbrass insert nut Materialbrass, copper FinishPlain or as request SizeM4~M60 or ... heading, Cold forging, Hot forging, Forming, Cutting, Shrink diameter, Threading, Thread rolling, Drawing, Pickling, Passirating, Waste water treatment, Grinting, Upseting, Slotted, Sharing ...