Threaded Plug Gage, Dimension Type Inch, Gauge Type Go (Plus); No-Go (Minus), Handle Design Assembly, Included Handle STI Plug 3, Thread Class 2B, Thread Size 1/2 In.-13, 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 Light Blue, Hardness RC 70/72, Included Certification Certificate of Accuracy, Long Form Calibration Certificate No, Pitch Diameter - Go Member 0.5499 in