The Big 12® is seven tools in one like 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.

• Matte finish to prevent glare
• 1/4 and 1/2 in spaced notches to facilitate scribing lines
• Black gradations for easy reading
• Great for deck framing and stairway building