Straight Edge Flatness Tolerance Not Applicable Calibration Certificate Not Certified Straightness Tolerance 4 micron Parallelism Tolerance Not Applicable Thickness 0.39 in Coating Chrome Flexibility Rigid Edge Style Beveled Color Black Backing Material Not Applicable Finish Satin System of Measurement Metric/SAE Includes Case Length - SAE 19 11/16 in Length - Metric 500 mm Width - SAE 3/8 in Width - Metric 10 mm Magnetic Nonmagnetic Material Stainless Steel