What you will get (Metric Scale Type): 1 x 3 Color-coded groove Big Scale Architect Scale Ruler, 1 x 3 Color-coded groove Small Scale Architect Scale Ruler, 1 x Black Standard Metal Ruler. So whatever project you’re working on, there’s a ruler in this deluxe bundle for it. Architect's Big Scale: 1:100, 1:200, 1:250, 1:300, 1:400, 1:500; Architect's Small Scale: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125; and a Standard Metric & Imperial Conversion metal straightedge ruler. Premium Material: Made of professional grade solid aluminum and coated by anodized technology, this set of triangular scale rulers with 3 color-coded grooves and clear permanent markings, will never fade or rub off, keeping glossy. Practical and solid dimensional triangular design with clean edges without ridges will help to make perfect lines conveniently, perfect for the drafting and measuring of architectural drawings, easy and quick to read and select desired scale to finish your work. Triangular scale with professional grade and supreme accuracy is used for architecture, drafting, engineering, blueprints, geometry drawing, mechanical project, school work widely, a great and perfect tool & gift for any architect, draftsman, engineer, students, etc. It is a specialized ruler. It is used in making or measuring from reduced scale drawings, such as blueprints and floor plans. It is marked with a range of calibrated scales (ratios). Tips: Always make sure your pencil tip is extra sharp and use a drafting or fine-point pen; a wide mark could throw off your measurements, and even the smallest of increments on the paper can translate into a major difference in the structure. Features: -The architect triangular scale is made from professional grade solid aluminum, heavier than other hollow / plastic architect rulers. -All measurements are Precision Clear-Etched and will never rub off or smudge. -The scale ruler designed to facilitate the drafting and measuring of architectural drawings, such as floor plans, blue prints and orthographic projections -A perfect measuring tool for any architect, draftsman, engineer, or student Specification: Material: Professional Grade Solid Aluminum