Fairgate 12" aluminum engineer's scale ruler. Durable, professional-quality engineering drafting scale is made from anodized aluminum with a solid core. Printed black graduations, non-glare finish, and color-coded furrows edges. Graduated 10, 20, 30, 40, 50, 60 parts to the inch; with left to right reading calibrations. Fairgate #41-112 triangular engineer scales are made in the USA.