I was extremely disappointed. The product is folded on arrival and when unfolded one shelf simply fell off,-- broken. The thing is very flimsy and badly finished. There is one additional piece, like a short dowel with a threaded insert together with one screw. I cannot find anywhere that this item would fit or be required. I wish to return this bookcase for a full refund, for which I assume I shall need and will be happy to receive paperwork from you.