... 3Surface:Black,Zinc,Dacro 4Certificate:ISO9 Different types of grade 8.8 bolt specification Details of the product:1Materials: 1045, 45#, 40Cr ... .) 5Surface: Black, Zinc-plated, Dacro, etc. 6Proven technique & good quality.7Packaging: wood pallet &carton8We can produce by customer's drawings ... China. 2.From 2006, we have manufactured the products of high speed railway and now they are being used. We ...