Threaded Ring Gauge, Long Form Calibration Certificate No, Material Tool Steel, Dimension Type Inch, Gauge Type Go/No-Go (Plus/Minus), Pitch Diameter 0.2258 (Go), 0.2225 (No-Go), Pitch Diameter - Go Member 0.2258 in, Pitch Diameter - No-Go Member 0.2225 in, Thread Class 2A, Thread Length 11/32 in, Thread Size 1/4 In.-28, Thread Type UNF, Compatible Holder Size 2T, Finish Uncoated, Gauge Design Adjustable, Hardness RC 60-62, Included Certification Certificate of Accuracy with NIST Traceability