J5808 Class ZZ Go Pin Gauge Material Steel Finish Black Oxide Diameter 0.6520 in Diameter Increment 0.0005 in Diameter Range 0.6260 in to 0.7505 in Diameter Sub-Range 0.6505 in to 0.6750 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