PREMIUM MATERIALS: The multi-angle measuring ruler is made of high-quality 5mm aluminum alloy with durable metal knobs and bolts, and the surface is coated with a black oxide layer. The measuring tool is rustproof and will not corrode. This universal square is stronger and more durable than plastic rulers. With proper storage, it will last a long time in your toolbox. EASY TO USE: The angle ruler features six rulers and metal knobs with 3 positioning holes. You can adjust the six metal knobs to the desired shape, lock them in place, then mount the ruler on the material you need to cut, quickly mark the measurement, and make accurate cuts, saving time and improving efficiency. LASER ENGRAVING: The angle measuring instrument is calibrated using precision laser engraving technology. It is highly wear-resistant and designed for long-term use without fading or corrosion. Markings are available in both metric and imperial units, ideal for precise angle measurements. Unlike other products, the engraved scale will remain clear and permanent over time. EASY TO CARRY: The six-fold angle measurer is a compact and portable tool. It folds easily, saves space, and is simple to store. It can be carried in a pocket or backpack, making it convenient for on-the-go use. MULTI-USE: A highly practical precision tool that simplifies challenging tasks. The multi-angle aluminum measuring ruler is ideal for general layout work, making it easy to create curves, arches, plumb cuts, and more. Suitable for woodworking, masonry, tiling, glass, stone, laminate, construction, architectural, and engineering projects. An essential tool for carpenters, masons, craftsmen, and DIY enthusiasts.