The square-tube cage is a common unit-load turnover box, a type of warehouse cage widely used in high-bay warehouses, production workshops, and distribution centers. Its storage benefits are direct: uniform specs, fixed capacity, visible contents, and easy stocktaking. Specific features: it pairs with all kinds of handling equipment, stacks four layers for three-dimensional storage, folds flat when empty to save space, and carries a galvanized surface that resists factory and outdoor corrosion for long life. Built from strong steel bar resistance-welded, with a bottom U-channel weld-reinforced for extra strength. Across transport, handling, loading, and storage it cuts cost and lifts efficiency. Line the cage with PVC board or cardboard to carry scratch-prone products. Structural details: multi-point resistance welding for durability; a pin-latch structure so doors open even while stacked; bent metal handles for a natural, easy grip; spiral hinges that fold smoothly when idle.