... ... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. A good non-standard fastenerS manufacturer for your better ... is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum ... ,Combined type...FinishZinc plated,Nickel plated,Dacroment Plated,chromium plated,Tin plated,Black phosphating ,anodized ,Parkerising,and Environmental Plated is used in ...