... 3Surface:Black,Zinc,Dacro 4Certificate:ISO9 Different types of grade 8.8 bolt specification Details of the product:1Materials: 1045, 45#, 40Cr, ... used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and Africa and ... Factory view figures: PackagingFactory viewTesting equipmentsWorkshop Welcome your visit! Different types of grade 8.8 bolt specification