Straight Edge Flatness Tolerance 0.006 mm 0.06 mm Calibration Certificate Not Certified Straightness Tolerance Not Applicable Parallelism Tolerance Not Applicable Thickness 0.31 in Coating Not Applicable Flexibility Rigid Edge Style Square Color Silver Backing Material Not Applicable Finish Not Applicable System of Measurement Metric/SAE Includes Case Length - SAE 24 in Length - Metric 610 mm Width - SAE 2 in Width - Metric 51 mm Magnetic Nonmagnetic Material Steel