Architectural Scale Ruler - 12" Aluminum Triangular Architect Scale Ruler for Drafting Ruler, Metal Scale Ruler, Blueprint - with Imperial Measurements IMPERIAL SCALE - The classic architect's triple-sided scale: 1-1/2", 1, 3/4", 3/8", 3/16", 3/32", 1/2", 1/4", 1/8", 3, 16 PREMIUM QUALITY - Constructed of high-grade anodized aluminum, this metal scale drawing ruler provides a lightweight and durable feel making it easy to use for any project. WIDE APPLICATION - Achieve the precision your work deserves. The architect triangular scale ruler is the perfect tool for any architects, engineers, draftsman, artists, designers, teachers or students. CONVENIENT&PRACTICAL - Our 12" triangular architect scale ruler features 3 sides with 6 different scales, color-coded grooves for quick and accurate selection of the desired scale. MULTI-PURPOSE - The architectural drawing scales ruler designed to facilitate the drafting and measuring of architectural drawings, such as floor plans, blue prints, and orthographic projections.