Alvin 270PX mechanical drafting scale ruler. Quality scales made from high-impact, boxwood-color plastic with tapered edges. Hot foil-stamped graduations and color-coded furrows. Both architect's and engineer's graduations: 1/8, 1/4, 1/2, 1-inch to the foot; 1/4, 3/8, 1/2, 3/4 size; 50ths and 16ths. Supplied in plastic sleeve. Quality-made in Germany.