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Milwaukee Thunderbolt Silver & Deming drill bits are designed for performance in low to high tensile strength materials, stainless steel and cast iron. Thunderbolt twist drill bits are made from premium industrial-grade steel with heavy-duty cutting surfaces that power through deep or shallow holes with lightning speed. A special flute geometry adds strength while providing increased chip ejection. Thunderbolt twist drill bits have a heavy duty 135 degree split point for easy penetration and a 1/2 in. reduced shank with 3 milled flats which prevent slippage in a jawed chuck.
- Extreme durability - thicker web provides greater strength and longer life
- 135 degree split point tip starts on contact to prevent walking
- The parabolic flute clears chips fast
- Corrosion resistant - black oxide coating helps resist corrosion of the bit
- Accurate and clean drilling holes
