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A two by four (or two-by-four or 2x4) is the name of a particular size of lumber. It is probably the most common lumber size used in modern construction: two by fours are the basic building block for such common structures as balloon-frame housing. Originally these boards were two inches by four inches in cross-section, with an indeterminate length. Due to changes in the way lumber is cut, they now usually measure approximately 1 3/4 inches by 3 1/2 inches.
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