Thirteen inches between shelves is generous for a four-tier unit, so hardbacks and box files stand upright rather than lying flat. X-braces across both sides and the back stiffen the metal frame against racking, and an anti-toppling bracket anchors the top to the wall. The boards are 0.7 in thick with a wipe-clean white surface. It measures 26 x 14 x 47.5 in, weighs 26.5 lbs and stands 4 in off the floor, enough for a robot vacuum to pass beneath. Open sides and back keep a 47.5 in unit from blocking light in a narrow room. Protective foot pads sit under each upright. Assembly is required.