Threaded Plug Gauge Assembly Set, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Handle Design Double End, Included Handle Taperlock 2, Thread Class 2A, Thread Size 7/16 In.-28, Thread Type UNEF, Tolerance Class X, Gauge Length - Go Member 1 in, Gauge Length - No-Go Member 1 in, Gauge Material Tool Steel, Handle Color Blue, Handle Length 3 in, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability, Pitch Diameter - Go Member 0.4132 in