The MILWAUKEE RED HELIX 15PC Cobalt Drill Bit Set is engineered for extreme durability and long life in hard metal applications. The QUAD EDGE tip delivers a precision start and features four cutting edges to create smaller chips for faster material removal and less heat leading to improved performance. Designed with a VARIABLE HELIX flute that begins with an aggressive 35 helical angle and ends at 15 for rapid chip removal. The bit also features an internal thicker tapered web that greatly increases strength, reducing premature breakage. Ideal for various tough metal applications including but not limited to Stainless Steel, Cast Iron, and Thick Metal. MILWAUKEE RED HELIX Cobalt Drill Bits provide up to 15X life vs. black oxide drill bits. Set is organized in a customizable accessory case designed for use in PACKOUT.