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Thunderbolt® drill bits are designed for extreme durability and long life. Ideal for drilling on curved surfaces, requires less effort to drill and is highly recommended for use with portable drills. Feature a thicker core than a standard drill bit, providing strength and protects against side-load breakage. A specially designed parabolic flute form clears chips and debris fast to keep the bit cool. A 135 Split Point tip starts on contact to keep the bit from walking for fast accurate holes.