... plating, Tin-plating, copper-plating, the wreath oxygen resin spraying, the heat disposing, hot-dip galvanizing, black ... spring, Extension spring, Torsion spring ,Coil spring etc7 Producing Equipment:Spring machine Jinju & 502S(Spring coiling machine, Pressure spring machine, CNC computer spring ... company was founded in October, 2000, specializing in the production of CNC/AUTO lathe, springs, shafts, ...