Unified thread plug gauge 2B UNC UN UNEF 1/4 5/16 3/8 7/16 1/2 Right hand Fine Thread gauges UNF 1/4-28 5/16-24 7/16-20 1/2-28

Unified thread plug gauge 2B UNC UN UNEF 1/4 5/16 3/8 7/16 1/2 Right hand Fine Thread gauges UNF 1/4-28 5/16-24 7/16-20 1/2-28

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