Pipe Threaded Plug Gauge, Dimension Type Inch, Handle Design Member Only, Thread Size 3-1/2 In.-8, Thread Type NPT, Tolerance Class X, Gauge Finish Uncoated, Gauge Material Tool Steel, Handle Length None, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Standards ASME B1.20.1, Thread Direction Right Hand