... , triangle thread, metric thread, tapping thread, drilling thread, half thread, full thread etc.2.Head type: Hexagon head, Mushroom head, Pan ... , stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze, medium carbon alloy steel etc.Surface TreatmentZn-plating, Ni-plating, Cr-plating ... more, please click our website: http://gdsx.en.alibaba.com carbon steel drywall bugel screw