... plating Screw Thread:taptite ISO: ISO9001:2008, ISO14001:2004 Features: Blue zinc plated Hex Head Tapping Screws 1.Material: Mild carbons ... :black oxide,zinc plated(white zinc, black zinc, colour zinc, blue zinc), phophated, plain finish, nickel plated, chromated and etc.3 ... .8.Packing:Inside is punny bag packing to avoide the wet air and outside is Carton and pallet or according to ...