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The Big 12 Speed Square (w/ bar)
The Big 12® is seven tools in one: a framing square, try square, miter square, protractor, saw guide, stair gauge and out-of-square corner angle finder.
It’s constructed of heavy-gauge aluminum alloy and includes the
Layout Bar for use in determining out-of-square corners. Also included are the Swanson® Blue Book for roof and stairway layout and Layout Bar with hardware.