METRIC SCALE: Length : 30 cm. Includes 6 commonly used scales: 1:20, 1:25, 1:50, 1:75, 1: 100, 1: 125. 6 rules in one. No need to waste time figuring out how to measure each increment LASER ENGRAVED MARKING: The markings on the ruler are laser engraved for perfect definition. Very fast and easy reading without error. These markings will never fade or smudge so you can always see every increment clearly ALUMINUM Made of high quality anodized aluminum, corrosion resistant, durable and lightweight, not easily deformed. The edges are chamfered, no accidental cuts Precision: Sharp graduations and precise markings for supreme precision make the ruler professional. A perfect measuring tool for any architect, writer, engineer, teacher or student. Specifications: Triangular ruler (six scales): 1:20, 1:25, 1:50, 1:75, 1: 100, 1: 125 Color: Black Types of technology: Laser engraved. Material: Made of anodized aluminum alloy. Scope of delivery: 1 triangular architect's ruler Note: This does not include other things, the color is based on the first picture and Other pictures only show effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!