Pin Gauge Set, Material Steel, Diameter Increment 0.001 in, Diameter Range 0.9170 in to 1.0000 in, Gauge Type No-Go (Minus), Number of Gauges 84, 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