Black Oxide Drill Bits but can be used in all twist drilling applications. Ideal for tough applications and provide up to 10X life vs. The 135° split point tip delivers a precision start and prevents walking for fast, accurate holes. Home > Products > Accessories > Drilling Accessories > Metal Drilling > Cobalt Drill Bits > 14 PC Milwaukee Thunderbolt. RED HELIX Drill Bit (48-89-2306) (1) 5/32 Milwaukee Thunderbolt Cobalt Drill Bit. ![]() Designed with a variable helix that includes an aggressive 35° helix angle which ends at 15°, the cobalt bits with RED HELIX provide Rapid Chip Removal limiting heat buildup to Stay Sharper Longer. Milwaukee Cobalt RED HELIX Drill Bits are engineered for extreme.
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