... .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 ... years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2.Our company had good reputation with customers ...