Swanson Big 12 Speed 12 In. Aluminum Rafter Square replacement Stylish design that will enhance

Stylish design that will enhance the look of your door

In the case of a power outage

Entrance by key only

stains or sticky residue

Featuring serrated edges for reliable grip

Swanson Big 12 Speed 12 In. Aluminum Rafter Square replacement Stylish design that will enhanceCast 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.