Choice 20 mm to 47 mm MASTER X – XX PLAIN BORE RING GAGE, Chrome Gauge
From Federal, Pratt & Whitney Hemco, Hitco, Southern Gage, Van Keuren, Ottawa Gage. 23 mm – XX. 25 mm – XX O.G.I. 25.021 mm – XX. 23.086 mm – X. 30.00 mm – X. 32 mm – 32.00066 cal. 43.002 mm – CLX.