1″ 3/8-24 UN Threaded Ring Gauge 2A GO NOGO 1″ 3/8-24 UN 2A Thread Ring Gage
Class of fit: 2A including T=(GO) Z=(NOGO). Style: Solid RH( right hand). T=GO Z=NOGO. 1 X 1″ 3/8-24 UN Threaded Ring Gauge 2A NOGO. 1 X 1″ 3/8-24 UN Threaded Ring Gauge 2A GO. If there’s a problem, just let us know and we fix it.