WAVE PLATE HEAD SCREW 1.ISO,ANSI,JIS,DIN,BS& non- ... :4.8 ,6.8,8.8,9.8........ WAVE PLATE HEAD SCREW,DOUBLE HEAD SCREW,KNURLED HEAD SCREW A good ... SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum is good Aluminum ... type,slotted point type,square type,Combined type...FinishZinc plated,Nickel plated,Dacroment Plated,chromium plated,Tin plated,Black phosphating , ...