Features: Mistubishi scale and plastic scale designed to facilitate the drafting and measuring of architectural drawings, such as floor plans, blue prints, and orthographic projections. Triangular ruler made from high impact aluminum and high quality plastic build to last. Scale clear, built-in scale. Precise Imperial Scale, color-Coded with different color grooves, you are able to quickly and accurately select your desired scale. Tri-scale precision for drawing paper. Excellent material, durable and lightweight, easy to breakage, not easily deformed, smooth lines. Lightweight, and durable, making it easy to use this engineering scale ruler for blueprints or any professional or educational project. Specifications: Material: Plastic; Aluminum Alloy Type: Triangular Ruler Small Ratio: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125 Large Ratio: 1:100, 1:200, 1:250, 1:300, 1:400, 1:500 Color: Black, Silver, Gold, Yellow and Red Size: Approx. 30cm/11.81in Weight: Approx. 107g Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 1 Piece Triangular Scale Ruler