Grade:4.8,5.6,8.8,10.9,12.9 Surface:plain, black,zinc Shanghai Suyu Railway Fastener Co., Ltd is a professional manufacturer of railway fasteners and standard components in China. Our products are approved by BV, SGS. We can provide products as following :1. E clip/Rail anchor Type :e1609. e1809. e1817. e2055. e2056. e2009. e2001. e2006. PR401. PR309.... Raw material : 60Si2MnA Surface : plain ( ...