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