Straight Edge Flatness Tolerance 0.015 mm Calibration Certificate Not Certified Straightness Tolerance Not Applicable Parallelism Tolerance 22 micron Thickness Not Applicable Coating Not Applicable Flexibility Rigid Edge Style Square Color Green Backing Material Not Applicable Finish Not Applicable System of Measurement Metric/SAE Includes Case Length - SAE 60 in Length - Metric 1 500 mm Width - SAE 1 9/16 in Width - Metric 40 mm Magnetic Nonmagnetic Material Magnalium