1、ALUMINUM ALLOY: Rafter square is made of precise aluminum alloy, which is strong, durable, hard and corrosion resistant, and the surface has been polished many times, safe to use, easy to carry. 2、PRECISE SCALE: Triangle square has precise and clear scale and permanent markings, it provides precise measurements, marked to the finest millimeter, with easy readability and long term use. 3、EASY TO READ: Aluminum alloy rafter square has an easy to read level that you can easily support the triangle ruler flush with the wood, with embedded magnets for good suction. 4、REMOVABLE SHORT RULER: Woodworking triangle ruler has a stainless steel short ruler, easy to remove, easy to slide measurement, increasing the practicality and versatility of the product. 5、MULTIPLE USES: Carpenter square is suitable for marking square and 45 degree lines, protractors, framing squares, triangle squares, and marking horizontal bases, making it an ideal tool for woodworkers and builders.