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The Milwaukee 48-89-2321 3/8 -Inch Thunderbolt Cobalt drill bits are designed for extreme durability and long life in specialty applications. The Thunderbolt web features a thicker core than a standard drill bit, which provides ultimate strength and protects against side-load breakage. A specially designed parabolic flute form clears chips and debris fast to keep the bit cool. A precision start, 135 Split Point tip starts on contact to keep the bit from walking for fast accurate holes. Excellent for drilling on curved surfaces, requires less effort to drill and is highly recommended for use with portable drills.
Milwaukee Cobalt RED HELIX Drill Bits are engineered for extreme durability and long life in hard metal applications. Designed with a Variable Helix that includes an aggressive 350 Helix Angle which ends at 150, the Cobalt bits with RED HELIX provide Rapid Chip Removal limiting heat buildup to Stay Sharper Longer. The 1350 split point tip delivers a precision start and prevents walking for fast, accurate holes. Ideal for tough applications and provide Up to 10X life vs. Black Oxide Drill Bits but can be used in all twist drilling applications.
Milwaukee Cobalt Drill Bits with Red Helix are engineered with a Variable Helix that starts with an aggressive 35° cutting edge which ends at 15° providing Faster Material Removal. Aiding in material removal the Chip Breaker decreases the size of chips leading to less heat buildup to Stay Sharper Longer. The 135° split point tip delivers a precision start and prevents walking for fast, accurate holes. Cobalt is ideal for Hard Metal applications to give you up to 10x life versus Black Oxide Drill Bits but can be used in all applications.
The DEWALT Black & Gold Metal Drill Bits feature a black and gold coating to prevent rust. The tapered web design provides extreme durability to resist breakage. The bits feature a 3 flats shank to reduce spin out in the chuck. Black & Gold metal drill bits are made of heavy duty High Speed Steel for drilling into a variety of materials including plastic, wood, and metal. Each bit features a 135 degree split point tip design to help reduce walking.