Pipe Threaded Plug Gauge Dimension Type Inch Gauge Type Go/No-Go (Plus/Minus) Handle Design Double End Included Handle Taperlock 3 Thread Size 3/8 In.-18 Thread Type NPSF Tolerance Class X Gauge Finish Uncoated Gauge Material Tool Steel Handle Color Blue Handle Length 3 1/4 in Handle Material Aluminum Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Pitch Diameter - Go Member 0.6205 in Pitch Diameter - No-Go Member 0.6257 in