1、Aluminum Alloy: Made from solid aluminum alloy, this triangular angle ruler is built to last. Its high hardness, erosion resistance, and glossy polished finish make it user friendly and portable. 2、Easy Leveling: The built in level allows you to effortlessly level your protractor against the wood. The embedded level makes sliding for measurements easier, adding to its practicality and versatility. 3、Accurate Markings: The square construction with clear, accurate graduations and permanent etched markings ensures maximum readability, and long lasting use. It measures to the finest millimeter. 4、Multiple Angle Measurement: With multiple fixed angle stops at 30 degree, 45 degree, 60 degree and numerous angle holes, this woodworking angle ruler caters to diverse marking and measuring needs. 5、Versatile Tool: This right angle ruler protractor can be applied for various woodworking projects, including measuring, marking, transferring angles, and squaring stock, convenient and practical.