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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.
SWANSON® Square Set, 12 in Blade Length, 1/8 in Graduation, Aluminum Alloy Base, Aluminum Alloy Blade
| Base Material | : | Aluminum Alloy |
| Blade Length | : | 12 in |
| Blade Material | : | Aluminum Alloy |
| Graduation | : | 1/8 in |