... 4.8 ,6.8,8.8... Rivet nut ,tubular rivet ,rivets and nuts 1.What’s the specification of our Products ? MaterialCarbon steel,Stainless steel ... Tin plated,Blackphosphating ,anodized ,and Environmental Plated is used in our products,it is no toxic metal of Hexavalent chromium ... ,Eastern Europe,Asia,Western Europe .3)Service:OEM service offered,Design service offered.4)Make samples as per customer's request ...