... The box also has four large indents, inwards on top and outwards on the bottom, and then each box can easily ... be stacked on top of each other.This box has 5U of standard ... flat pack form and comprises of four pieces, one top, one bottom and two sides, the whole thing ... is easily assembled with the screws .Contents / quantity1 top, 1 bottom, 2 sides, 8 M4 screws, 20 ...