The Milwaukee 6 Piece RED HELIX Cobalt Drill Bit Kit is engineered for extreme durability and longer life in hard metal applications. The Milwaukee Cobalt drill bits are designed with a VARIABLE HELIX that includes an aggressive 35° Helix Angle which ends at 15°. The drill bits have QUADEDGE TIP to decrease heat buildup and drill faster. The 135° split point tip delivers a precision start and prevents walking for fast, accurate holes in Hard Metal, PVC and wood. The tapered drill bits feature a new ENHANCED TAPERED WEB that strengthens the bit's core to increase flute durability. The cobalt twist drill bits are ideal for tough applications, including stainless steel drilling. The Milwaukee 7 Piece SHOCKWAVE RED HELIX Titanium Drill Bit Set is engineered for extreme durability and long life. The QUAD EDGE tip delivers a precision start and four cutting edges to create smaller chips for faster removal and less heat leading to longer bit life. Designed with a Variable Helix that includes an aggressive 35° helical angle, which ends at 15°, these tapered drill bits with RED HELIX provide Rapid Chip Removal limiting heat buildup to Stay Sharper Longer. The bits also feature an internal ENHANCED TAPERED WEB that greatly increases their strength, reducing premature breakage. Ideal for various applications including but not limited to wood, plastics and metals, Milwaukee Red Helix Titanium Drill Bits provide up to 5X life vs. black oxide drill bits.