... .8 ,6.8,8.8,9.8.... Copper Bolts,Copper Bolt,Brass Bolts.1.What’s the specification of ... our Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper ... is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum ... with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so ...