Class ZZ Go Pin Gauge, Material Steel, Finish Black Oxide, Diameter 0.3850 in, Diameter Increment 0.0005 in, Diameter Range 0.0610 in to 0.5005 in, Diameter Sub-Range 0.3805 in to 0.3900 in, Dimension Type Inch, Gauge Type Go (Plus), Included Certification Certificate of Accuracy with NIST Traceability, Surface Finish 10 Microinch or Better, Tolerance 0.00020 in, Tolerance Class ZZ, Hardness RC 60/65, Long Form Calibration Certificate No, Overall Length 2 in, Standards ISO 17025