... ,6.8,8.8,9.8... CYLINDER HEAD SCREW,BRASS COPPER DECORATIVE SCREW,SMALL SCREW . A good non-standard fastenerS manufacturer for ... specification of our Products ? MaterialsCarbon steel,Stainless steel,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such ... ...Stainless steel is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum is good ...