Solid. Unlike engineer's rulers with printed graduations, our engineer's ruler is made of solid anodized aluminum. 100% laser graduation for perfect accuracy.Quality & 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. Graduated scales in two directions for easy reading from right to left or left to right.Many uses: 30cm - Weight: 100g. Easy to carry and store. Handy measuring tool for any project. Ideal for architects, draftsmen and students. Ruler Feature: Precise graduations. Chamfered edges. Anti-rust. 3 concave sides with 6 different scales. Easy to carry. < /p> High quality solid aluminum. The ruler is the perfect tool for architects, draftsmen, engineers and students. Features: High quality anodized aluminum. The ruler measures 12 inches in length approximately and has 3 concave sides with 6 scales most commonly used: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125. Sleek, durable black finish. Note: the data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.