1 1/2-4 LH ACME thread plug gage Class of fit: 2G including GO NOGO Brand new Standard: ASME B1.5 Style: Taper-lock double ends with handle If you need some special AMCE thread gages we haven't listed, please send message to us Each set of ACME thread plug gauge 100% calibrated with quality assurance in our factory. If clients need long form calibration certificate, we can send to professional third party testing lab ISO17025 accredited to get. it need USD35 extra fee per set.each set including GO NOGO.