Easily measure and scale drawings. This revolutionary tool, designed by an architect, combines features of many drafting tools into one, with more calibrations than a triangle scale. Convenient to store because of its flat, ruler-like shape. Compass point holes allow users to draw circles, arcs, angles and triangles. Plus, solid metal ruler is ideal for use as a cutting edge. Photo anodized markings, so they will never rub off. The silver finish is smooth and resistant to solvents and cleaners. Standard architect graduations. Measures 12 x 1-1/2".