with a brand history of more than 20 years, shanghai rensheng fastener manufacturing co.,ltd is a fastener manufacturer intergrated with design,production and sales.the company offers characteristic products such as ansi b 18.2.1 hex cap screws with gr.2,5,8;din-933&din-931 with class4.8,5.8,6.8,8.8,10.9;etc.
