Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go (Plus), Pitch Diameter 1.444 in, Pitch Diameter - Go Member 11.16 in, Thread Class 2A, Thread Length 3/4 in, Thread Size 1 1/2 In.-12, Thread Type UNF, Compatible Holder Size 6T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B1.2, Tolerance Class X