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There are several sizes, however the one most commonly referred to is the large, rectangular block with two holes - usually used for building foundations. This type of block measures 8" x 8" x 16" and weighs approximately 29 pounds.

8 by 8 by 16 inches is the nominal size, but 7 5/8 by 7 5/8 by 15 5/8 inches actual size. It's 3/8 of an inch smaller to all room for the mortar that goes between the blocks.

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