Straight Edge, Flatness Tolerance +/- 0.0006 in, Calibration Certificate Not Certified, Parallelism Tolerance +/- 0.0002 in/ft, Thickness 0.22 in, Edge Style Square, Finish Brushed, System of Measurement Metric/SAE, Features Quick Reading, Includes -, Length - SAE 36 in, Length - Metric 900 mm, Width - SAE 2 7/16 in, Width - Metric 60 mm, Material Steel