Metal Twin Bunk Beds Black.
Platform beds leave more room for this than mattress-and-box spring combinations do. When you build the rails that frame the mattress, you need to make sure that the "box" forms they are an inch or two bigger than the length and width of the mattress, so that you have space inside the beds. Make sure the slats you use are two of four for strength.

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Metal Twin Bunk Beds Grey

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Metal Twin Bunk Beds Unique

Metal Twin Bunk Beds White