Assembling this was a pain. The hollowed out holes in one section were way too shallow to fit the dowels. I didn't want to suffer through repackaging and shipping the item back and waiting for a replacement so I opted to perform surgery on the holes and the adjoining dowel pieces (i.e. drill, hacksaw) costing me more time than I anticipated. I hope the piece still supports the books that it will hold after these adjustments. Wayfair, have your 3rd party vendor check the pieces for this error before shipping! Such a pain!