... Standard WE SUPPLY ALL TYPE OF THREAD PLUG & THREAD RING GAUGES LIKE ACME, TRAPEZOIDAL, BUTTRESS, MODIFIED SQUARE, PLAIN GAUGES, TAPER, METRIC, UNC, UNF ... TO 300 mm· TAPER THREAD RING GAUGES : 1/16” TO 10”· TAPER THREAD PLUG GAUGES : 1/16” TO 10”· PLAIN PLUG GAUGES : 0 ... .17 TO 300 mm· PLAIN RING GAUGES : 3 ...