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The carpenter’s square is actually an L-shaped tool, usually with a 2-inch-wide, 24-inch-long leg perpendicular to a 1-1/2-inch-wide, 16-inch-long tongue. The most common use is for framing, laying out and marking patterns for framing, roofing, and stairway work. It’s also useful as a straightedge for determining the flatness of a surface, and for marking cutoff work on wide stock.
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