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 chevron is made of high quality aluminum alloy, high hardness, strong toughness, not easy to rust. Wide use: This carpenter's square can be used as a protractor, miter, scribe saw guide, framing square and ruler, ideal for all construction and renovation projects. Easy to mark your cutting lines: This triangular 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 mark quickly and precisely your cutting lines on your cords. Size: 18 cm metric triangular ruler: 18 x 18 cm, 30 cm metric triangular ruler: 30 x 30 cm Note: The data is all manually measured, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to actual item received.