Threaded Plug Gauge Assembly Set, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Handle Design Double End, Included Handle Taperlock 3, Thread Class 2A, Thread Size 9/16 In.-12, Thread Type UNC, Tolerance Class X, Gauge Length - Go Member 1 7/8 in, Gauge Length - No-Go Member 1 1/4 in, Gauge Material Tool Steel, Handle Color Blue, Handle Length 3 1/4 in, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Pitch Diameter - Go Member 0.5068 in