Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Pitch Diameter 1.1941 (Go), 1.1879 (No-Go), Pitch Diameter - Go Member 1.1941 in, Pitch Diameter - No-Go Member 1.1879 in, Thread Class 2A, Thread Length 3/4 in, Thread Size 1 1/4 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