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The Swanson(R) Speed(R) square was first developed by company founder Albert Swanson(R) in 1925. This innovative tool combines five tools in one like a try square, miter square, saw guide, line scriber and protractor. The Speed(R) 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. The Speed(R) square includes the Swanson(R) blue book of rafter length and roof construction and also features markings for using the Swanson(R) One-Number(R) method of rafter layout. The Swanson(R) Speed(R) square is our most popular product and remains the most trusted square of its kind.