Milwaukee 48-20-4415 1-1/2" X 17" X 22" 4-Cutter Spline Bit

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Item Number:MLA48-20-4415
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Milwaukee 48-20-4415 1-1/2" X 17" X 22" 4-Cutter Spline Bit

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The 48-20-4415 includes:

  • 1x Milwaukee 48-20-4415 1-1/2'' X 17'' X 22'' Spline Shank Rotary Hammer Bit


  • This is the most common shank
  • New 4-Cutter Head design
  • Centering point provides precise round holes
  • Reduced vibration - New flute design
  • New Brazing formula for up to 20% longer life
  • (Diameter x Usable Length x Overall Length)

Milwaukee®'s 48-20-4415 Spline 4-Cutter Rotary Hammer Drill bits feature a 4-Cutter 4x90° tip geometry to avoid lock up in rebar, patented rebar chamfers for increased durability, and a high volume flute for fast debris removal. Used for drilling holes in brick, block, concrete, and reinforced concrete.

Tech Specs:

  • Brand: Milwaukee
  • Model: 48-20-4415
  • MPN: 48-20-4415
  • UPC: 045242103867
  • Type: Spline Bit
  • Cutter Geometry: 4-Cutter
  • Diameter: 1-1/2"
  • Length: 22"
  • Useable Length: 17"
  • Package Qty.: 1
Overall Rating for Milwaukee 48-20-4415 1-1/2" X 17" X 22" 4-Cutter Spline Bit
(based on 1 review)
Milwaukee Thunderbolt 1-1/2 bit
By BoB from Chicago Area on October 9, 2014
Sylentmite is an expansion powder used to crack rock/concrete and requires a 1-1/2 inch bore hole.
A friend allowed me use his drill, so I purchased this bit to do the job as opposed to renting a more powerful tool for $80/day.
Thunderbolt drilling takes twice as long as the rental unit, but for me, time is not a consideration.


I would recommend this item to a friend.

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