Steel Rule Spring Tempered Thickness 0.05 in Graduation Marks 1/64 in Coating Chrome Graduation Color Black Flexibility Rigid Graduation Mark Style Etched Folding Rule Type Not Applicable Backing Material Not Applicable Finish Satin System of Measurement SAE Features Quick Reading Includes - Rule Type Rule Numeric Marks Inches Numeric Format Decimal Length - SAE 18 in Length - Metric Not Applicable Width - SAE 1 1/8 in Width - Metric Not Applicable Graduation Units Inches