Pipe Thread Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type L-1, Thread Size 1 1/2 In.-11 1/2, Thread Type NPT Plug Gauge, Finish Uncoated, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B1.20.1, Tolerance Class X