Each unit is 20.5" x 11" x 23" with three tiers, and because they stack you can start with one under a bench and add more as a collection grows. Thickened boards with an anti-tipping device keep a stacked column steady, and anti-slip foot pads hold position on tile or hardwood. Every tier carries 35 lbs, enough for boots as well as flats, and the wipe-clean white surface stays easy to maintain in a busy entry. It also works as an open shelf for baskets or plants. Each rack weighs 6 lbs. Assembly required.