Tap & Drill Bit Set, National Coarse Thread, 1/2 X 13-in.

1/2" x 13, National Course Thread, Tap & Drill Set, Carbon Steel, Ideal For Routine Maintenance, Repair Work & For Rethreading Where High Accuracy & Tolerance Thread Is Not Critical, Straight Flutes Are Ground To Provide Rapid Chip Removal For Efficient Threading, Designed For Hand Threading Work In A Variety Of Materials Taps Produce A Class 2B Thread, Includes #25 Drill Bit.

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