... ,anodize types of springs/types of extension springs/drum type spring We provide the product by our customer' ... ,brass,stainless,steel,steel,iron,Bakelite and other plastic materialsMax length1000mmMax diameter400mmTolerance0.01mmSingle weightWithin 200KGSurface treatmentZinc,nickel, ... casting,CNC machining,hand polishing,automatic polishing and plastic injecting.We are looking forward to long-term ...