Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go (Plus), Pitch Diameter 0.9441 in, Pitch Diameter - Go Member 0.9441 in, Thread Class 2A, Thread Length 11/16 in, Thread Size 1 In.-12, Thread Type UNF, Compatible Holder Size 5T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B1.2, Tolerance Class X