This is the base cabinet to customize your own White Mini Stackable. It comes with casters and has 19 spaces. The drawers and trays that you order to go with this unit come with the rails. The outside deminsions of the singel mini stacker are:

Outside dimensions: height: 28-1/4" depth: 14" width: 14" If you are using paper trays, you will only need to fill 18 slots as they set in the cabinet at an angle so your paper is displayed. If you are mixing drawers and paper trays, the 2 inch drawers take 2 slots, the 1 inch drawers take 1 slot. Count 1 paper tray as 2 slots and the rest are one slot. You can take a look at the pictures of the kits and see the spacing needed.

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