Material Aluminum alloy Color Black Style Durable Division range 0-30 centimeters About this item Metric Style: Includes a 17 cm and 30 cm metric triangle ruler with matte black surface to prevent glare, corrosion-resistant and durable, not easy to break. No sharp edges, will not hurt your hand. Top Quality: The rafter square metric, rafter square made of high quality aluminum alloy, high hardness, strong toughness, not easy to rust. Widely Used: This carpenter square can be used as a protractor, miter saw, scribing saw guide, framing square and ruler, ideal for all building and remodeling projects. Easily 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 angle cuts with the etched protractor scale to help you mark your cutting lines quickly and accurately on your stringers. Size: 17cm metric triangle ruler: 17*17cm, 12 inch metric triangle ruler: 30*30cm