Threaded Plug Gauge Assembly Dimension Type Metric Gauge Type Go/No-Go (Plus/Minus) Handle Design Double End Included Handle Taperlock 3 Thread Class 6H Thread Size M20 x 2.50 Thread Type Metric Tolerance Class X Gauge Finish Chrome Plated Gauge Length - Go Member 22.20 mm Gauge Length - No-Go Member 12.70 mm Gauge Material Tool Steel Handle Color Yellow Handle Length 3 5/8 in Hardness RC 70-72 Included Certification Certificate of Accuracy with NIST Traceability