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Keson KS120 - 12-Inch X 12-Inch X 17-Inch Large Speed Square With Layout Guide

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Nothing beats the BIG 12 Square for deck framing and stairway building. A bit larger for convenience (12" x 12" x 17), the Big 12 has all the features of the Speed Square. A unique, layout bar is included to lay out stringers for stairs, or to determine out-of-square corners. Includes The "Blue Book" of Rafter Lengths and Roof Construction.