it is aluminum shelf that could stand alone like book closet. It is composed of plate that width is 340mm, height is 14mm, length is 300mm, 600mm, 900mm, 1200mm, 1500mm, 1800mm it depends on customer's need. Its surface is aluminum anodized. It could be assemble various shape. Front and rear is opened, each side is closed by modular aluminum plate. According to customer's needs, it could be made big and small, simple and complex. Usally, it is used for book self or audio shelf, collectings. It is high end living products. Place it in book room for storage. It could be assembled each plate by bolting. We can see assembly bolt.