... 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 ... outdoor installationAutomobile. carriages, containers, shipbuilding, refrigeration equipments Cross recessed ball head stainless steel tapping screw