Swanson Tool Co S0107 "Big 12" 12-Inch Speed Square Layout Tool with Blue Book Product Description The Big 12 Speed Square is a 12-inch version of the Swanson Speed Square with added features for building stairs. This innovative tool combines 7 tools into 1: 1. Try Square, 2. Miter Square, 3. Saw Guide, 4. Line Scriber, 5. Protractor, 6. Out-of-Square Corner Angle Finder, and 7. Stair Layout Square. The Big 12 Speed Square is die-cast for durability and accuracy. Made of heavy-gauge aerospace aluminum alloy, it is built to last. Black-filled gradations stand out against a matte finish for easy reading and are simple to use with the Swanson One-Number Method of rafter layout. This model includes the Swanson Blue Book for Roof and Stairway Layout as well as the Layout Bar for use in determining out-of-square corners when building stairways. The Swanson Speed Square is our most popular product and remains the most trusted square of its kind. Look for the Diamond cutout for genuine Swanson products. From the Manufacturer Swanson's Speed Square is a popular pocket sized square that incorporates features of the framing square, tri, mitre, and protractor squares. Common rafter and hip/valley rafter scales permit one-number references for all cuts. The square is merely rotated to the proper roof pitch value on either scale to assure the correct angle cut. The slot along the scales will accommodate an adjustable locking pin for repetitive cuts using any 1/4-inch bolt and nut. Comes with a handy, 62 page pocket sized booklet that provides vital instructions, reference diagrams, and tables for the construction of roofs and stairs. Features Heavy gauge aluminum alloy with matte finish to prevent glare 1/4 in. and 1/2 in. spaced notches to facilitate scribing lines Black gradations for easy reading Patented layout bar Great for deck framing and stairway building! USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.