Straight Edge, Flatness Tolerance +/- 0.0002 in, Calibration Certificate Not Certified, Parallelism Tolerance +/- 0.0002 in/ft, Thickness 0.17 in, Edge Style Beveled, Finish Brushed, System of Measurement Metric/SAE, Features Quick Reading, Includes -, Length - SAE 12 in, Length - Metric 300 mm, Width - SAE 1 7/16 in, Width - Metric 36 mm, Material Steel