Metric triangle ruler: Includes 1pc 30cm metric triangle ruler, with matte black finish to prevent glare, corrosion resistant and durable, not easy to break. No sharp edges at all, no will not hurt your hand. Premium quality: The metric square rafter, rafter square made of high quality aluminum alloy, high hardness, strong toughness, not easy to rust. Widely used: This carpenter's square can be used as a protractor, miter, line scribe saw guide, framing square and ruler, ideal for all construction and renovation projects. Easy to mark your cutting lines: This triangle ruler uses a thicker edge design, can be used directly with the saw against the square for cross cuts or angled cuts using the engraved protractor scale, allowing you to mark quickly and accurately your cutting lines on your stringers.