... ,C17200,etcAlumimum100,5052,6061,6063,etc (2)Ability for the surface finish:ElectroplateZinc plated(while,colour,dacroment),Nickel plated,copper plated,gold ... ,electrophoretic coating,etc Polishing Grinding and polishing,etc,except mirror finish (3)Ability for tolerance:Roundess0.002mmCylindricity0.003mmRoughnessRa0.32Straightness0.01/200mm3 ...