1、[Aluminum Alloy Construction] Crafted from sturdy aluminum alloy, this rafter square tool is built to last, providing long lasting durability for all your measuring and layout needs. 2、[Precise Markings] Accurate scale markings on this carpenter square ensure precise and convenient measurements, making your projects more efficient. 3、[Versatile Use] With its innovative design, this triangular ruler protractor allows for easy and precise angle and layout measurements in engineering and woodworking projects. 4、[Easy Rotations] Rotate effortlessly at 90 or 180 degrees, enabling precise and accurate flatwork operations, adding convenience. 5、[With Jig Block] Equipped with a jig block for accurate repetitive markings, ideal for projects that require consistent and accurate measurements.