The MILWAUKEE SHOCKWAVE Impact Duty Electrical Step Bits are engineered to deliver the most durable and fastest impact step bit hole drilling solution. The step drill bits are made in the USA with global materials and give you best-in-class performance in impact drivers with the versatility to be used in drills. The ¼" hex shank has an optimized SHOCKZONE body providing you with the industry's most durable shank, reducing early shank breaks. A Titanium Aluminum Nitride (TiAlN) coating helps deliver you 5x longer life, while the step drill bit's Rapid Strike tip and dual spiral flute produce 2x faster holes. The step drill bit kit features the #1 1/8 - 1/2", #4 3/16 - 7/8", and #9 7/8" &1-1/8" step bits with laser engraving for a clear stop on size identification. The MILWAUKEE SHOCKWAVE Impact Duty 23PC RED HELIX Titanium Drill Bit Set is engineered for extreme durability and long life. 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 bits feature an internal thicker tapered web that greatly increases strength, reducing premature breakage. Ideal for various applications including wood, plastics, and metals. MILWAUKEE RED HELIX Titanium Drill Bits provide up to 5X life vs. black oxide drill bits.