Brick Mason Folding Rule Thickness 1.81 in Graduation Marks 1/16 in Coating Abrasive Resistant Epoxy Graduation Color Red Flexibility Rigid Graduation Mark Style Etched Edge Style Not Applicable Orientation Vertical Folding Rule Type Outside Read Backing Material Not Applicable Finish Unfinished System of Measurement Metric/SAE Accuracy +/-1.4mm Rule Type Folding Rule Numeric Marks Inches Millimeters Numeric Format Fractional Length - SAE 6 ft Length - Metric 1 800 mm