... plating,and other related metal materials.5.Making Process:CNC machining,Turning,Drilling,Polisheing,Tapping,Threading,Burnishing,Slab Milling,Face ... manufacturing hardware metal product over 10 years.8.All parts can be designed and maunfactured by our customers' drawings ... Various Industrial Spring/Auto Spring/Extension Spring manufactured by CNC machinary.10.ROHS compliant,reliable quality and best ...