Threaded Plug Gauge Assembly, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Handle Design Double End, Included Handle Taperlock 3, Thread Class 2B, Thread Size 9/16 In.-12, Thread Type UNC, Tolerance Class X, Gauge Finish Chrome Plated, Gauge Length - Go Member 7/8 in, Gauge Length - No-Go Member 1/2 in, Gauge Material Tool Steel, Handle Color Blue, Handle Length 3 1/4 in, Hardness RC 70-72, Included Certification Certificate of Accuracy with NIST Traceability