12 In. Aluminum Big 12 Speed Square, Rafter Square with Layout Bar and Blue Book
The Big 12 Speed Square is a 12 in. version of the Swanson Speed Square with added features for building stairs. Try Square, 2. Miter Square, 3. Saw Guide, 4. Line Scriber, 5. Protractor, 6. Out-of-Square Corner Angle Finder, and 7.