... .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 ... is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum is good Aluminum ...