Class ZZ No-Go Pin Gauge, Material Steel, Finish Black Oxide, Diameter 0.5750 in, Dimension Type Inch, Gauge Type No-Go (Minus), Included Certification Certificate of Accuracy with NIST Traceability, Surface Finish 10 Microinch or Better, Tolerance 0.0005 in, Diameter Range 0.5010 in to 0.