It's a necessary part for fixing the perforated board, but it's sufficient for assembling it on its own. If you put it in from the bottom to fix it on the back, it will fall unless you hold it down at first, so it would be better if you could put it in from the top. For me, I'm not assembling it on its own, but connecting it to make an N-Polda, so it would be nice if this part could be used to fix the perforated board on both sides. (Like a butterfly shape? So that it can be attached to both sides) It would reduce the amount of parts, make the location of the fasteners neater, and reduce costs. I know there are various things to consider, such as load capacity and the break-even point, but I would like you to consider this product, as Nitori is more than just a low-priced store.