-Threaded -Cast iron is mainly composed of iron, carbon and silicon alloy composition, with high strength, good toughness, plasticity and machinability. -Casting the primary color, the surface frosted, anti-rust treatment, threaded alignment, chassis formation. -Can be made bookshelves, drying racks, put objects, retro lighting, and other crafts. -All flanges have 4 holes for screwing door onto flat surfaces such as floors and walls.