bolt m10,iron bolts 1.ISO,ANSI,CE,JIS,DIN,BS& non- ... .Grade:4.8 ,6.8,8.8,9.8....... Bolt M10,Iron Bolt,Steel Bolts.1.What’s the specification of ... steel is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum is good ...