Straight Edge Flatness Tolerance 0.005 mm 0.05 mm Calibration Certificate Not Certified Straightness Tolerance Not Applicable Parallelism Tolerance Not Applicable Thickness 0.25 in Coating Not Applicable Flexibility Rigid Edge Style Beveled Color Silver Backing Material Not Applicable Finish Not Applicable System of Measurement Metric/SAE Includes Case Length - SAE 12 in Length - Metric 305 mm Width - SAE 1 5/8 in Width - Metric 41 mm Magnetic Nonmagnetic Material Steel