Occupying only 16.5 in of wall, this narrow 4-tier bookshelf climbs 40 in to organize paperbacks, plants, and collectibles in tight apartments and offices. X-shaped crossbars reinforce the metal frame to a 132 lbs total capacity, and raised side rails on every tier stop items from sliding off the ends. Two anti-tip wall anchors secure the light 14.5 lbs tower, while adjustable foot pads level it over baseboards and uneven floors.