Rigid Rule Thickness 0.02 in Graduation Marks 1/64 in Coating Chrome Graduation Color Black Flexibility Flexible Graduation Mark Style Etched Folding Rule Type Inside Read Backing Material Vinyl Finish Satin System of Measurement SAE Accuracy + 0.006 in/- 0.0035 in Rule Type Rule Numeric Marks Inches Numeric Format Decimal Length - SAE 18 in Length - Metric Not Applicable Folded Length 6 in Width - SAE 13/16 in Width - Metric Not Applicable Graduation Units Inches