1-3/8"-24 UNS HSS Plug Tap | DWTST1-3/8-24P | DrillsandCutters.com
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Drillforce Left Hand Screw Machine Thread Tap Drill Bits HSS Straight Flute Imperial Size 3/16-24 1/4-28 5/16-24 3/8-24 7/8-19 - AliExpress