- Carbide tipped and made for use in drilling hardened steel in the range of 48 to 65 Rockwell "C"
- Holes may be drilled without annealing or appreciably changing the structure of the material
- This drill bit can be used for drilling BROKEN TAPS by relieving the pressure and assisting with backing out the tap with its counter clockwise spin
- When using left hand drill bits, your motor should be used in reverse mode
- NOTE: Heavy Pressure and low R.P.M.'s recommended. Cutting oil should be used. Recommended for use in drill presses, but can be used in portable drills.
- Set Includes 1pc each 1/8", 3/16", 1/4", 5/16"x 4, 3/8" x 4
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