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1) 52100 wire rods 2) 52100 seamless tubes 3) Stainless steel wire, (420C, 440C etc) 4) EN-19 ( SAE4140; SCM440 ) 5) Steel balls(ss steel balls, bearing steel balls, carbon steel balls) 6) Bearing machinery (i.e. polishing machine, super finishing machine, grinding machine, noise tester, etc) 7) Steel ball machinery (i.e. heading machine, flashing machine, noise tester etc) 8) Heatreatment equipment (various advanced industrial furnaces, quenching furnace, normalizing, annealing, tempering furnace etc)