12 inch, 300 mm rigid steel rule can be used to measure or as a straight edge Nonmagnetic tempered steel will not attract metal shavings Satin chrome finish has easy-to-read high-contrast black graduations Graduated in 10ths and 100ths of an inch on one side and 1mm and 1/2mm on the other Industrial quality precision steel rule. 24 inches long x 1 inch wide x 0.04 inch thick. 12 inch, 300 mm rigid steel rule can be used to measure or as a straight edge. Nonmagnetic tempered steel will not attract metal shavings. Satin chrome finish has easy-to-read high-contrast black graduations. Graduated in 10ths and 100ths of an inch on one side and 1mm and 1/2mm on the other. Industrial quality precision steel rule. 24 inches long x 1 inch wide x 0.04 inch thick. For over 60 years, SPI has introduced innovative products to the metalworking and laboratory industries. SPI measuring instruments are durable, precise, and reliable — all backed by an industry-leading 2-year warranty.