Pipe Threaded Plug Gauge, Dimension Type Inch, Gauge Type No-Go (Minus), Handle Design Member Only, Included Handle Not Applicable, Thread Class Not Applicable, Thread Size 1/4 In.-18, Thread Type NPSF, Tolerance Class X, Gauge Finish Uncoated, Gauge Material Tool Steel, Handle Length None, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Long Form Calibration Certificate No, Pitch Diameter – No-Go Member 0.4904 in, Thread Direction Right Hand