... 4.Finish:zinc plated and so on NameSelf Tapping Screw MaterialLow carbon steel,Stainless SteelFinishwhite zinc plated, yellow zinc ... plated,plain,HDG,Dacromet,and so onHeadHex washer head,Phillps flat head,Phillips pan headPackingless than 25kgs bulk into carton ... installationAutomobile. carriages, containers, shipbuilding, refrigeration equipments Cross recessed ball head stainless steel tapping screw