The bookcase is adorable but there is apparently not a uniform size for dowels/screws/holes. Although I am usually good at assembling, I spent hours trying to get screws in. Manually and with drill- and then the screws were stuck halfway and would not go in or out. Turned the project over to daughter and husband. No luck. I became determined only cause- shipping this mess would have been even more time consuming. Turned project over to son and with help from two high tech auto mechanics, they were able to get the screws out and bookshelf assembled. Seems from reviews either the screws go right in- or they do not fit at all. I would recommend anyone ordering- try one screw and see which category your set fits into!