Walnut Stacking Shelves Start with a basic unit and combine with extra add ons for a personal storage solution. Flat packed assembly that takes one person roughly ten minutes. Stacking Shelves utilise steel bars that run through the shelves making them extra strong. ‐ Dimensions: W 42 x D 28.5 x H 121 cm Add‐on shelving units can only be attached to the side panels of a base unit. Please note, a stand‐alone base unit cannot be expanded upwards when placed vertically and cannot be expanded sideways when placed horizontally.