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Aluminum extruded triangular ruler with anodized finish. Laser etched graduations. U.S. Standard: 12 In. (inch) scale divided in 3, 1-1/2, 1, 3/4, 3/16, 3/32, 1/2, 1/4, 1/8, inch per foot. 1 division in 1/16th inch. Perfect for architects.