The S-shaped profile means each of the six compartments opens to alternate sides, so a run of books reads as a zigzag rather than a wall of spines - the reason this piece works as a room divider as well as storage. Shelf height is a consistent 12 in and each holds 44 lbs. Engineering board makes up the 31.5 x 9 x 75 in frame at 52.5 lbs, heavy enough to stand steady at that height. The narrow 9-in depth keeps it against a wall in a hallway. Black finish suits a modern or industrial room.