Premium Material: 7 inch triangle bracket made of high quality aluminum alloy with a matte black finish to prevent glare. Corrosion resistant and durable. Good resistance to oxidation. Not easy to break. High Precision: Its thick edge can be used directly with the saw against the square for cross cuts or angle cuts using the engraved protractor scale, allowing you to quickly and accurately mark your lines on your stringers.</ p>Humanized Design: The aluminum triangular ruler is equipped with a strong cast aluminum body with clear and precise scaling that is common for woodworking. Good oxidation resistance! User-friendly design, exquisite workmanship and long service life. Suitable For: For all construction and renovation projects. Also useful for hobbyists, home builders, fabricators, DIYers and artists. Application: The triangular metric ruler can be used as a protractor, miter, line scriber, saw guide and tri/meter square, framing square and ruler, good for all construction and remodeling projects.