The "Big 12" is a 12" speed square made by Swanson Tool Co. The square is seven tools in one: a framing square, try square, miter square, protractor, saw guide, stair gauge & out-of-square corner angle finder. It’s constructed of heavy-gauge aluminum alloy & includes the Layout Bar for use in determining out-of-square corners. Also included are the Swanson Blue Book for roof & stairway layout & Layout Bar with hardware. Great for deck framing and stairway building! Made in the USA.
Product Overall Size Model # Swanson "Big 12" Speed Square With Layout Bar ~ 12" Size 12 - 1/2" x 12 - 1/2"S0107