Swanson Tools The Big 12 Speed Squares Product Details: 7 tools-in-one - framing square, try square, miter square, protractor, saw guide, with layout bar stair guide to determine out-of-square corners 1/4 in spaced notches to facilitate scribing lines Black-filled markings with layout bar and blue book. Includes: SwansonTM Blue Book for Roof and Stairway Layout Layout Bar with Hardware