Class ZZ No-Go Pin Gauge, Material Steel, Finish Black Oxide, Diameter 0.3190 in, Diameter Increment 0.0005 in, Diameter Range 0.0610 in to 0.5005 in, Diameter Sub-Range 0.3105 in to 0.3200 in, Dimension Type Inch, Gauge Type No-Go (Minus), 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