Threaded Plug Gauge, Dimension Type Metric, Gauge Type No-Go (Minus), Handle Design Member Only, Included Handle Not Applicable, Thread Class 6H, Thread Size M20 x 1.50, Thread Type Metric, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length – No-Go Member 12.70 mm, Gauge Material Tool Steel, Hardness RC 70-72, Included Certification Certificate of Accuracy with NIST Traceability, Long Form Calibration Certificate No, Pitch Diameter – No-Go Member 19.22 mm, Standards ASME B1.16M