Metric Style: Includes 18cm and 30cm metric triangle ruler, with matte black finish to prevent glare, corrosion resistant and durable, not easy to break. No sharp edges, will not hurt your hand. Premium Quality: The square rafter is made of high quality aluminum alloy, high hardness, strong toughness, not easy to rust. Wide Usage: This carpenter square can be used as a protractor, miter, scribe saw guide, framing square and ruler, great for all construction and remodeling 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 scale, allowing you to quickly and accurately mark your cutting lines on your beadboards. Size: 18cm metric triangle ruler: 18 x 18cm, 30cm metric triangle ruler: 30 x 30cm Note: The data are all measured manually, Please allow 1-3cm error due to different light and display, there may be some color differences, please refer to