... steel is SS201,202,302,304,316...copper is shiny brass , pure copper,such as H62,H65,H68...Aluminum is good ... ,Ball head,Button head...Socket typePhillip type,Pozi type,Eleven type,hexagonal type,Torx type,trangle type,slotted point type,square type,Combined type...FinishZinc plated,Nickel plated,Dacroment ...