... :SEMS SCREW 4. ISO9001:ISO14 Features:Stainless steel wing screws with plastic head A. Screw Prosduct detail 1)MaterialCarbon Steel of grade ... , SUS304,SUS316 and etc. 2)Finishplain finish, black oxide,zinc plated(white zinc, black zinc, colour zinc, blue zinc), chromated,nickel ... the responsible QC, Engineers and after sale worker to deal with such things.In case this thing happened, we will deliver ...