The Johnson RAS-1 is a 7-Inch Alum Rafter Angle Square. Designed for general carpentry use, the Johnson 7-Inch Aluminum Rafter Angle Square features a solid aluminum cast body with exclusive CNC machined edges. Other highlighted features include permanent molded gradations, and a low-glare, protective powder coat finish. It can also be used as a ruler or can be used to measure angles. The diagonal edge has markings for laying out rafters, roof trim, and stair angles. Features:Solid aluminum body with CNC machined edges for greater accuracy and durabilityPermanent graduations and numbers are easy to readThick edge is useful as a saw guideLow-glare, protective powder coated finishComplete instruction manual included with rafter tablesWhat's In the Box:Johnson RAS-1 7-Inch Alum Rafter Angle Square