| 摘要 |
A universal concrete or masonry block with four walls, a hollow center within the four walls, and a recessed knockout panel on each wall. Each recessed knockout panel is half the height of the block and has recessed cutting slots partially through the wall on either side of the recessed panel. The recessed knockout panels may be removed to leave an opening as desired on any or all of the four sides of the block. The opening(s) may be used to support a fence rail, a light or a plant.
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