Empire Magnum Heavy-Duty Rafter Square, 12" Edge, 1/8" Graduations, Aluminum: * Mark lumber and lay out angles accurately when you choose this superior, heavy-duty square * Permanently stamped conversion tables simplify measurement tasks * Thick, bend- and break-proof aluminum frame may be safely used as a saw guide * Included instruction manual and complete rafter tables help ensure proper usage * Square Type: Rafter-Angle * Blade Length: 12" * Material(s): Aluminum