... .8,9.8,10.9........ Non Standard Fastener,Special Fastener,Iron Fastener.1.What’s the specification of our Products ? MaterialCarbon ... steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium carbon steel ... will be packing as per the customer's requests .additional process Washer assembly,Heat treatment,Baking hydrogen,Anti-slipping patch can ...