Rigid Rule Thickness 0.09 in Graduation Marks 0.5 mm (Front) 1 mm (Back) 1/32 in (Front) 1/64 in (Back) Coating Chrome Graduation Color Black Flexibility Rigid Graduation Mark Style Etched Edge Style Square Orientation Horizontal Folding Rule Type Outside Read Finish Satin System of Measurement Metric/SAE Features With Groove on the Back Suitable for Combination Square Set (2278 Series) Accuracy +/- 0.006 in Includes Pouch Rule Type Rigid Rule