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 of Rafter Length and Roof Construction, and Layout Bar™ and hardware.
• Matte finish to prevent glare
• 12" body to cover larger materials
• Packaged with the 60-page Swanson® Blue Book and Layout Bar™ with hardware
• Used for laying out steps