Pipe Threaded Plug Gauge Dimension Type Inch Handle Design Double End Included Handle Taperlock 3 Thread Size 1/4 In.-18 Thread Type NPT Tolerance Class X Gauge Finish Uncoated Gauge Material Tool Steel Handle Color Blue Handle Length 3 in Hardness RC 60-62 Included Certification Certificate of Accuracy with NIST Traceability Standards ASME B1.20.1 Thread Direction Right Hand