... .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 ... manufacturer with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2.Our ...