1PCS 3B Thread Plug Gauge Steel Gauge American Standard Fine UNC UNF UNS 12-32 7/8-9 3/8-32 1/2-13 1/2-24 Measure Tool

1PCS 3B Thread Plug Gauge Steel Gauge American Standard Fine UNC UNF UNS 12-32 7/8-9 3/8-32 1/2-13 1/2-24 Measure Tool

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