... steel Finish:bright zinc Tolerance:=/-0.02mm low cost and Features:Black High-precision CNC Processing Shaft Parts 1.Material:Brass H62, H65 ... nickel plating, gold plating, chromated4. Appearance: clear shiny surface, with complete neat body.5. Inspection: in house test are available ... . We have the responsible QC, Engineers and after sale worker to deal with such things.In case this thing happened, ...