... .Zinc,Nickel or Chromate,plating,anodize types of springs/types of extension springs/drum type spring We provide ... .01mmSingle weightWithin 200KGSurface treatmentZinc,nickel,chrome,brass plating oxidation,black etcMOQ50pcs Small order acceptable.Machining equipmentCNC machining ... About USWe are specialized in producing various kinds of precise machinery parts,Door locks parts,window parts and ...