Pin Gauge Set Material Tool Steel Finish Uncoated Diameter Increment 0.001 in Diameter Range 0.2510 in to 0.5000 in Gauge Type No-Go (Minus) Number of Gauges 250 Overall Length 2 in Surface Finish Uncoated Tolerance 0.0002 in Tolerance Class ZZ Hardness RC 60/65 Included Certification Certificate of Accuracy Long Form Calibration Certificate No Standards ISO 17025 2005 Dimension Type Inch