ACME Pluge Gauge Specification: ASME/ANSI B1.5Manufacturing Range: 1/4″ TO 15.75″ ACME Ring Gauge Specification: ASME/ANSI B1.5Manufacturing Range: 1/4″ TO 22″ STUB ACME Plug Gauge Specification: ASME/ANSI B1.8Manufacturing Range: 1/4″ TO 15.75″ STUB ACME Ring Gauge Specification: ASME/ANSI B1.8Manufacturing Range: 1/4″ TO 22″