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US Thread Ring Gauge Set: 1/4-20/28 UNC, 3/8-16/24, 5/16-18/24 UNF, Go/No-Go, 2A Standard.
US Thread Ring Gauge Set: 1/4-20/28 UNC, 3/8-16/24, 5/16-18/24 UNF, Go/No-Go, 2A Standard.