The Alumidrafter is a revolutionary tool designed by an architect that combines features of many drafting tools into one. It has more calibrations than a triangle scale and stores easier because of its flat shape. The Alumidrafter allows you to measure, scale drawings, drawÊcircles & arcs, and draw angles & triangles. This Alumidrafter has all the standard calibrations an Architect could need. They are photo anodized - becoming part of the aluminum so they will never rub off. The Silver finish is smooth and resistant to solvents and cleaners.