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- Bottom Tap with 1-2 lead in threads
- High Speed Steel
- Bronze oxide
- Recommended drill size is 27/64 for 78 percent of theoretical threads
- Made in the USA
This fits your .
1/2-13 NC T61HDB, Fractional, Thunder Tap, High Speed Steel, Bottoming, Bronze Oxide Bottom Tap with 1-2 lead in threads.