Pipe Thread Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type L-1, Thread Size 3/8 In. -18, Thread Type NPT, Finish Uncoated, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B 1.20. 1, Tolerance Class X. This item has been restricted from sale in the following state (s): []