Double End Bolt,Special 1.ISO,ANSI,CE,JIS,DIN,BS& non- ... .Grade:4.8 ,6.8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What ... 35,40CrMo,SCM435,10B38...Stainless steel is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65 ...