Class X Go Pin Gauge, Material Steel, Finish Uncoated Steel, Diameter 0.1636 in, Diameter Increment 0.0001 in, Diameter Range 0.0751 in to 0.2810 in, Diameter Sub-Range 0.1601 in to 0.1650 in, Dimension Type Inch, Gauge Type Go (Plus), Included Certification Certificate of Accuracy with NIST Traceability, Surface Finish 4 Microinch or Better, Tolerance 0.00004 in, Tolerance Class X, Hardness RC 60/65, Long Form Calibration Certificate No, Overall Length 2 in, Standards ISO 17025