Solid. Unlike engineer's rulers with printed graduations, our engineer's ruler is made of solid anodized aluminum. 100% laser graduation for perfect precision. Quality and chamfered edges : Updated triangular ruler with chamfered edges for safety Every design deserves the quality and precision that the triangular architect ruler Lightweight and durable ruler, easy to use for any project Made of high quality anodized aluminum, this ruler is very durable. All-in-one ruler: The metric ruler includes 6 of the most commonly used scales: 1:20, 1:25, 1:50, 1:75, 1:100 , 1:125. No need to waste time figuring out how to measure each increment. Scales graduated in two directions to easily read from right to left or left to right. Many uses: 30 cm - Weight: 100g Easy to carry and store Handy measuring tool for any project Ideal for bows hitects, designers and students. Characteristic of the ruler: Precise graduations. Chamfered edges. Anti-rust. 3 concave sides with 6 different scales. Easy to take. High quality solid aluminum. The ruler is the perfect tool for architects, draftsmen, engineers and students. Features: High quality anodized aluminum. The ruler is approximately 12 inches in length and has 3 concave sides with 6 of the most commonly used scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1: 125. Sleek, durable black finish.