The Starrett 13A Double Square features a precision-machined hardened body paired with a 4-inch graduated blade, allowing machinists, toolmakers, and craftsmen to quickly check 90° and 45° angles with confidence. The clearly marked blade graduations make it easy to take accurate linear measurements alongside squareness checks in a single compact tool.
Built to Starrett's exacting quality standards, this double square is designed for long-lasting durability in shop, layout, and inspection environments. It is well suited for scribing lines, setting depths, and verifying right angles on workpieces across a wide range of metalworking, woodworking, and general manufacturing applications.