Threaded Plug Gauge, Dimension Type Inch, Gauge Type No-Go (Minus), Handle Design Member Only, Thread Class 2B, Thread Size 1 In.-8, Thread Type UNC, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length - No-Go Member 5/8 in, Gauge Material Tool Steel, Hardness RC 70-72, Included Certification Certificate of Accuracy with NIST Traceability, Pitch Diameter - No-Go Member 0.9276 in, Standards ASME B1.2, Thread Direction Right Hand