Thread Gauges

SAE or Common Standard will identify Imperial (Inches) thread pitches:
6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 24, 28 (T.P.I. - Threads per Inch).

Heavy Hex Thread Gauge will identify Heavy Hex standard sizes in Imperial thread pitches:
4, 4-1/2, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 18 (T.P.I. - Threads per Inch).

Fit into the vinyl sleeve which also may fit into your wallet so you always have it with you.