Threaded Plug Gauge, Dimension Type Inch, Gauge Type No-Go (Minus), Handle Design Member Only, Included Handle Not Applicable, Thread Class 2B, Thread Size 1/2 In.-28, Thread Type UNEF, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length – No-Go Member 3/8 in, 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 0.4816 in, Standards ASME B1.2