Shelf spacing steps down the frame at 13, 12.5, 13 and 13 in rather than repeating, which leaves the tallest bay where oversized books usually go. The metal frame carries walnut-toned engineered wood shelves, each rated to 22 lbs, with 4 in of open height beneath. At 26 x 14 x 62 in and 33 lbs the unit is tall and light, so anchoring it once loaded is worthwhile. The open sides keep a 62-in bookcase from closing off a narrow room. A user guide is included for assembly.