socket SCREW 1.Screw Material:SS304,SS316, ROHS 2.Screw Finish:plain, ... 4. ISO9001:ISO14 Features:Stainless steel wing screws with plastic head A. Screw Prosduct detail 1)MaterialCarbon Steel ... zinc plated(white zinc, black zinc, colour zinc, blue zinc), chromated,nickel plating,dacromet and etc.3)Normal ... QC, Engineers and after sale worker to deal with such things.In case this thing happened, we ...