Swanson Big 12 Speed 12 In. Aluminum Rafter Square Black & Decker Thread pattern reduces wood splitting

Thread pattern reduces wood splitting and friction

Channellocks double-faced sledge hammer is constructed with a head forged from high-quality carbon steel

Maintenance-free

Key from exterior and turn handle clockwise from interior will lock or unlock exterior knob or interior knob

Swanson Big 12 Speed 12 In. Aluminum Rafter Square Black & Decker Thread pattern reduces wood splittingCast 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.