The SAVAGE™ Builders Square is essential in the construction of wood framed buildings. Perfect for determining the flatness of a surface plane or creating a true 90° angle in cutting to size. The Builders Square is used where walls meet, calculating rafter angles, creating stairways, calculating octagons, and can be used as a diagonal square. The SAVAGE™ Builders Square’s precision laser etching makes this square the most accurate in the industry. A simple tool with innovative design that will last you a lifetime.