Pin Gauge Set, Material Steel, Diameter Increment 0.001 in, Diameter Range 0.0065 in to 0.0605 in, Gauge Type Go (Plus), Number of Gauges 55, Overall Length 2 in, Tolerance +/-0.00020 in, Tolerance Class ZZ, Hardness RC 60/65, Included Certification Certificate of Accuracy, Long Form Calibration Certificate Yes, Standards ISO 17025, NIST, Dimension Type Inch