... Screw Thread:taptite ISO: ISO9001:2008, ISO14001:2004 Features: Blue zinc plated Hex Head Tapping Screws 1.Material: Mild carbons Steel of ... and etc.2.Finish:black oxide,zinc plated(white zinc, black zinc, colour zinc, blue zinc), phophated, plain finish, nickel plated, chromated and etc.3.Standard :DIN7985 ... for you with the good quality and competitive price. Blue zinc plated Hex Head Tapping Screws