Swanson Big 12 Speed 12 In. Aluminum Rafter Square Larson self-aligning screw holes make installation

self-aligning screw holes make installation easy and hassle-free

Use any time of year to save money by saving energy

2 - 4 digit user codes preset at the factory

without the need to switch between utensils

high strength repair material

Swanson Big 12 Speed 12 In. Aluminum Rafter Square Larson self-aligning screw holes make installationCast aluminum alloy. Measures 12" x 12" and 17" across the diagonal, which is marked off in degrees from 0 deg. (degree) to 90 deg.. Features scribe bar, notched every 1 4", to lay out parallel lines. Lay put bar adjusted out to fit out of square corner. 2 adjustable stop pins can be set for proper run and proper rise. Includes Blue Book of Rafter Length and Roof Construction.