This the is worst thing I’ve ever assembled (and I have assembled A LOT of furniture over the years). The screws for the shelves aren’t long enough leaving the support boards underneath impossible to tighten and secure. I grabbed some screws from my garage that were half inch longer and they went completely though to the side of the shelf that shows. The instructions are also not as clear as they could be. 
Update requested replacement part 4 and was sent two placement part 2 so my only option was to reorder an entire replacement item nearly a month after ordering the original item. Very disappointed.