Black Oxide-Coated Pin Gauge Set, Material Tool Steel, Finish Black Oxide, Diameter Increment 0.02 mm, Diameter Range 1.30 to 4.98 mm, Gauge Type Go (Plus), Number of Gauges 185, Overall Length 2 in, Surface Finish Uncoated, Tolerance 0.0002 in, Tolerance Class ZZ, Hardness RC 60/65, Included Certification Certificate of Accuracy, Long Form Calibration Certificate No, Standards ISO 17025:2005, Dimension Type Metric