Straight Edge Flatness Tolerance +/- 0.0004 in Calibration Certificate Not Certified Parallelism Tolerance +/- 0.0002 in/ft Thickness 0.17 in Edge Style Square Finish Brushed System of Measurement Metric/SAE Features Quick Reading Length - SAE 24 in Length - Metric 600 mm Width - SAE 1 7/16 in Width - Metric 36 mm Material Steel