The shelf board (one piece) L gray color for the optional flat desk enlarging the storage space in the step of the flat desk, W1600mm use. I put baggage and am very convenient for the storing of the file. It is the step shelf which can effectively utilize the space under the desk. In 有効内寸 when they attached a shelf board to a flat desk, W1497 X D260 X H260mm, the effective space under the shelf board are H335mm. A color: L gray materials: Steel sheet (the resin firing painting) maximum loading mass: 20 kg of attachment means: assembling product to screw