Swanson Big 12 Speed Square with Layout Bar

The Big 12 is seven tools in one: a framing square try square mitre square protractor saw guide stair gauge and out-of-square corner angle finder. It's constructed of heavy-gauge aluminium 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.