... 3.Grade:4.8 ,6.8,8.8..... Coupling Fasteners,Connecting Fasteners,Aluminum Fasteners. 1.What’s the specification of our Products ... shiny brass , pure copper,such as H62,H65,H68...Aluminum is good Aluminum.Meanwhile,we can use other materials accordingto customer's ... ,Eastern Europe,Asia,Western Europe .3)Service:OEM service offered,Design service offered.4)Make samples as per customer's request ...