Threaded Plug Gauge, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Handle Design Double End, Included Handle Taperlock 4, Thread Class 2B, Thread Size 1/2 In.-20, Thread Type UNF, Gauge Finish Uncoated, Gauge Material Steel, Handle Color Black, Included Certification Certificate of Accuracy, Long Form Calibration Certificate No, Standards ASME B1.2, Thread Direction Right Hand