3A Aerospace inspection UNJ UNJC UNJF thread ring gauge set Screw Gauges 4-40 6-32 8-32 10-32 1/4 5/16 3/8 7/16 1/2 9/16 3/4

3A Aerospace inspection UNJ UNJC UNJF thread ring gauge set Screw Gauges 4-40 6-32 8-32 10-32 1/4 5/16 3/8 7/16 1/2 9/16 3/4

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