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Product Description Five tools in one: a tri-square, a miter square, a protractor, a line scriber, and a saw guide. The Speed Square is constructed of durable heavy-gauge aluminum alloy. Includes markings for Swanson's One-Number Method of rafter layout, and is packaged with the Swanson Blue Book of Rafter Length and Roof Construction. Matte finish to prevent glare. Amazon.com The Swanson Speed Square is made of heavy-gauge aluminum alloy with black gradations for easy reading and a matte finish to prevent glare. This 5-in-1 tool easily transitions from try square to miter square, protractor, line scriber, or saw guide, and includes 1/4-inch spaced notches to facilitate scribing lines. Each speed square comes with a Swanson Blue Book instruction manual and a 1-year limited manufacturer's warranty. From the Manufacturer Original Speed Square. 5 Tools in One! One Number Method. Try Square, Miter Square, Protractor, Line Scriber, Saw Guide. Plain gradations, tag carded individually with Blue Book or in display merchandiser or bulk.