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. Its 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.
Heavy gauge aluminum alloy
Matte finish to prevent glare
1/4 in and 1/2 in spaced notches to facilitate scribing lines