... as your requirement is okStandardGB,GB/T,DIN,JIS,BSW,ANSI,ISO & non-standard productsSurfacePlain, Yellow ... TreatmentTempering,Hardening,Spheroidizing,Stress Relieving.StandardISO,GB,DIN,JIS,ANSI,BSWManufacture ProcessHeading/washer assembly/Threading/Secondary machine/ ... facilities and quality control for Bolt process as, even better, other Bolt manufacturers. Therefore, Dongguan Jinri Metal Products ...