Hot Dip Galvanized Screw:1,Sold directly from factory; 2, Have our own hot-dipped galvanizing production line; 3, ... Dia.16mm-60mm. Hot Dip Galvanized Screw:1,Sold directly from factory;.2, Have our own hot-dipped galvanizing production line;3 ... ,Used for iron tower,construction,highway railing and other indutrial use;5,Stable Quality.You are very welcome to visit us ...