The legs are on the widest extents of the frame, and are actually wider than my queen mattress. As a result it does not attach to the standard rails I have the bet setting on. The supports also attach to the back side in such a way that is not recessed, meaning the bolts will scratch the wall unless cushion is added to the back, and carefully done so as not to show beyond the extents of the headboard. Decent piece and fairly sturdy, but some lazy design work showing lack of forethought and emphasis on fast and cheap construction.