... :Black,Zinc,Dacro 4Certificate:ISO9 Different types of grade 8.8 bolt specification Details of the product:1Materials: 1045, 45#, 40Cr, 35CrMoA ... , P.R.China. 2.From 2006, we have manufactured the products of high speed railway and now they are being used. We ... so on.Pictures:1.certificate:2. Various honorary certificates:3.products:Zinc, Black, Dacron grade 8.8 hex bolts4. Factory view ...