12 inch triangular architect scale designed to facilitate the drafting and measuring of architectural drawings, such as floor plans, blue Prints, and orthographic projections Triangular ruler features 3 sides with 6 different scales, and made from high Impact aluminum, build to last Metal ruler never fading. Architect scale ruler with durable laser cut imperial prints for accuracy. They will not wipe or scratch off ever Professional grade for supreme accuracy color coded triangular scale for easy and quick selection of the desired scale The clear ruler is marked with standard imperial measurements: 1-1/2, 1, 3/4, 3/8, 3/16, 3/32, 1/2, 1/4, 1/8, 3, 16