Pin Gauge Set Material Steel Diameter Increment 0.02 mm Diameter Range 1.31 to 4.99 mm Gauge Type Go (Plus) Number of Gauges 185 Overall Length 2 in Tolerance +/-0.0050 mm Tolerance Class ZZ Hardness RC 60/65 Included Certification Certificate of Accuracy Long Form Calibration Certificate Yes Standards ISO 17025 NIST Dimension Type Metric