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 35° helix angle which ends at 15°, the cobalt bits with Red Helix™ provide rapid chip Removal™ limiting heat buildup to stay sharper Longer™. The 135° 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® 48-89-2523 Red Helix™ Cobalt Drill Bits, Metric, 10 mm