Milwaukee Tool 48-89-2313 1/4 Inch Thunderbolt Cobalt Drill Bit
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Manufacturer Milwaukee Tool
Mfg Catalog # 48-89-2313
North Coast Part # 664379


Our RED HELIX™ Cobalt Drill Bits are 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 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' new ENHANCED TAPERED WEB™ strengthens the bits’ cores to increase flute durability. Our cobalt twist drill bits are ideal for tough applications, providing up to 15X life vs. Black Oxide Drill Bits™. Choose from single RED HELIX™ Cobalt drill bit sizes ranging from 1/16" to 1/2" or Milwaukee drill bit sets.

  • Cobalt alloy for up to 15X Life vs. Black Oxide Drill Bits
  • QUADEDGE TIP™ designed to decrease heat build up and drill faster
  • 135° split point for precision start no walking
  • ENHANCED TAPERED WEB™ strengthens the bits core
  • VARIABLE HELIX™ Design for rapid material extraction
  • 3-Flat Secure-Grip™ helps keep the bit fixed within the the chuck
  • Designed for Hard Metals, PVC and Wood


  • Pack Qty: 1 Pack
  • Coating: Cobalt
  • Application: Wood|Stainless Steel|Metal|Plastic|PVC
  • Diameter: 1/4"
  • Variable Helix: X
  • Chip Breaker: X
  • Shank: 3-Flat


UPC 04524218828
GTiN 00045242188284
Finish Cobalt Coated
Diameter 1/4 in
Applications For Portable Drills
Shank Type 3-Flat
Pkg Qty 1 Pack
Coating Cobalt
Family Brand Name Milwaukee
Shank 3-Flat

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