Pin Gauge Set Material Steel Diameter Increment 0.001 in Diameter Range 0.0115 in to 0.2505 in Gauge Type Go (Plus) Number of Gauges 240 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