Aluminum Professional SquareKnow all the right angles when you choose this professional-grade, standard-design L square. Deep-stamped graduations, rafter tables and conversion charts keep you in the know. Corrosion-resistant, heavy-gauge aluminum provides excellent bend resistance. Punched hang hole enables pegboard storage. Compatible with Empire® stair gauges (sold separately). Square Type: Framing; Blade Length: 16"; 24".