Product Material: The scale ruler is made of aluminum alloy, corrosion-resistant and not easily worn or deformed Six Metric Sizes: The scale rule includes six scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125, allowing for flexible surveying Clear Grading: The scale ruler architect graduations are laser-etched, ensuring clear readings and preventing wear or fading Lightweight and Portable: Architectural scale ruler is lightweight and easy to carry, making it ideal for students, architects, and engineers Wide Applications: Triangle ruler is designed to help draw and measure floor plans, blueprints, details, etc., can be used for cutting, measuring, drawing and design, Manufacturer: fuzhou ningjie shangmao youxian gongsi