Taperlock Thread Plug Gage,3/4-20 Size
-20, Thread Type UNEF, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length - Go Member 7/8 in, Gauge Material Tool Steel, Hardness RC 70-72, Included Certification Certificate of Accuracy with NIST Traceability, Pitch Diameter - Go Member 0.Threaded Plug Gauge, Dimension Type Inch, Gauge Type Go (Plus), Handle Design Member Only, Thread Class 2B, 3B, Thread Size 3/4 In.