Item Type: Stackable Storage Bins Material: PP Package List 5 x Stackable Storage Bin 1 x Cover Plate 5 x Fixing Frame 4 x Wheels 1EASY FOLDING: Storage bins can be stacked in multiple layers, snap design, stable and secure. Single layer folding, simple installation, easy folding. 2SNAP LOCK: Folding storage box with snap lock, stacking stable and not easy to fall. Recess embedded, double side snap lock, not easy to shake. 3MAGNETIC SUCTION FUNCTION: Stackable storage box comes with magnetic suction function, easy to access. Easy storage, magnetic suction, a closed that is closed. 4TRANSPARENT BOX BOARD: Stackable storage bins with transparent box board, easier to take things. The bottom set pulley, move at will, no effort. 5THICKENED PP MATERIAL: Folding storage box container is made of thickened PP material, stronger and more durable, not easy to damage.