Very poor design, quality and packaging. You can’t put this together into a proper finished assembly. I guarantee you something will break before you finish assembling. Wrench sent with it is weaker than a toothpick, hokes in metal pieces are way oversized for those screws meaning shelves will never be good enough to take more than few pounds. 

Products like this turn you away from Wayfair. I think this was the last nail for me. 
I am shorting Wayfair stock and will wait it to go bankrupt. I give it two years.