J5809 Class ZZ Go Pin Gauge Material Steel Finish Black Oxide Diameter 0.8100 in Diameter Increment 0.0005 in Diameter Range 0.7510 in to 0.8325 in Diameter Sub-Range 0.8005 in to 0.8250 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