... 3.Grade:4.8 ,6.8,8.8,9.8... CYLINDER HEAD SCREW,BRASS COPPER DECORATIVE SCREW,SMALL SCREW . A good non ... of our Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as ... shiny brass , pure copper,such as H62,H65,H68...Aluminum is good Aluminum,R200...Meanwhile,we can use other materials accordingto customer ...