... the high quality cold-rolled steel plate metal library bookshelf wooden covered Advanced design idea,clever conception and mature technology make ... group):The body frame:12 pieces shelves,6 pieces bookend bars, 12pcs hanging plates, two pieces vertical columns,one top plate ... tie rodsThe sub-frame:12 pieces shelves,6 pieces bookend bars, 12pcs hanging plates,one piece vertical columns,one top plate ...