Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Metric, Gauge Type Go (Plus), Pitch Diameter 7.16 mm, Pitch Diameter - Go Member 7.16 mm, Thread Class 6G, Thread Length 8.7 mm, Thread Size M8 x 1.25, Thread Type Metric, Compatible Holder Size 2T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B1.16M, Tolerance Class X