Four of the eight shelves move, offering five height positions each in 1-in increments, so the same column can be reset from paperbacks to box files as its contents change. Fixed bays measure 10.5 x 8.5 x 17 in inside and every shelf carries 22 lbs. What makes the adjustment worth having is the format: 71 in of height over a 12 x 9 in plan, where a wasted inch of shelf gap is a wasted inch of storage. White engineered wood keeps the tower to 34 lbs. Anchor it to the wall before loading the upper tiers.