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Double Thread Bolt Stud Steel 8.8 Grade Machine and Tapping Thread Auto Parts Carburization Zinc Coating 144hours Dacromet Zinc Nickel Fastener, Find Details and Price about Stud Double Thread Stud from Double Thread Bolt Stud Steel 8.8 Grade Machine and Tapping Thread Auto Parts Carburization Zinc Coating 144hours Dacromet Zinc Nickel Fastener - Shanghai Kinsom Precision Hardware Co., Ltd.