Black Oxide-Coated Pin Gauge Set, Material Tool Steel, Finish Black Oxide, Diameter Increment 0.02 mm, Diameter Range 0.21 to 1.29 mm, Gauge Type Go (Plus), Number of Gauges 55, Overall Length 2 in, Surface Finish Uncoated, Tolerance +/-0.00020 in, Tolerance Class ZZ, Hardness RC 60/65, Included Certification Certificate of Accuracy, Includes Handle No, Long Form Calibration Certificate No, Number of Drawers 1, Standards ISO 17025:2005, Dimension Type Metric