Metric Design: Includes 18cm and 30cm metric triangle ruler, with matte black surface to avoid glare, corrosion resistant and durable, not easy to break. No sharp edges, won't 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, scribing saw guide, framing square and ruler, ideal for all construction and renovation projects. Easily Mark Your Cutting Lines: This triangular ruler uses a thicker edge design, can be used directly with the saw against the angle for cross cuts or angle cuts using the engraved scale, allowing you to mark your cutting lines on your cables quickly and accurately. Size: 18cm Metric Triangle Ruler: 18 x 18cm, 30cm Metric Triangle Ruler: 30 x 30cm Product Description Product Features: 1) Laser ruler with steel ruler, precise Writing, clear, not easy to wear. Easy to use, comfortable to hold and conversion