... Screw material:C1022 Screw Finish:zinc plating Screw Thread:taptite ISO: ISO9001:2008, ISO14001:2004 Features: Blue Zinc Plated Hex Head Drilling/Tapping ... , SUS304,SUS316 and etc.2.Finish:black oxide,zinc plated(white zinc, black zinc, colour zinc, blue zinc), phophated, plain finish, nickel plated, chromated and ...