Threaded Plug Gauge, Dimension Type Inch, Gauge Type Go (Plus), Handle Design Member Only, Thread Class 2B, 3B, Thread Size 1/4 In. -28, Thread Type UNF, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length - Go Member 1/2 in, Gauge Material Tool Steel, Hardness RC 70-72, Included Certification Certificate of Accuracy With NIST Traceability, Pitch Diameter - Go Member 0.2268 in, Standards ASME B 1.2, Thread Direction Right Hand. This item has been restricted from sale in the following state (s): []