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Product Details


  • Long life: Proprietary steel reduces breakage and extends bit life
  • Exact spot drilling: Threaded stud improves accuracy
  • Versatile design: Use with 11" extension for extra-deep drilling applications
  • Adaptability: Works with an SDS-MAX or spline shank adapter


Diameter 1-3/4"
Depth 45mm
Style Turbo Tunnel Bits


The Milwaukee® 1-3/4" Turbo Tunnel Head is an ideal alternative to core bits for extra-deep, large hole drilling in block, brick and concrete. When core bits aren't practical, the Turbo Tunnel Head lets you drill holes up to 36" deep. Note that multiple extensions will modify speed and efficiency. Use with any common hammer and an SDS-MAX
or Spline Drive Adapter. The Large Hole Drilling System offers maximum versatility to suit a variety of jobsite applications, hammers and depths. Simply choose an LHS core bit, tunnel bit or 4-cutter fluted bit in the size you need and add a spline shank or SDS-MAX shank adapter. For greater lengths, add 11" extensions (48-20-5079).

Model Options

Item/Cat # Style Diameter Depth  
48-20-5075 Spline Adapter Shank
48-20-5077 SDS-MAX Adapter Shank
48-20-5079 Extension
48-20-5081 Replacement Threaded Stud 35mm
48-20-5082 Turbo Tunnel Bits 1-3/8" 35mm
48-20-5083 Turbo Tunnel Bits 1-1/2" 40mm
48-20-5084 Turbo Tunnel Bits 1-3/4" 45mm
48-20-5085 Turbo Tunnel Bits 2-1/8" 55mm
48-20-5087 Turbo Tunnel Bits 2-5/8" 68mm
48-20-5089 Turbo Tunnel Bits 3-1/8" 80mm
48-20-5070 4-Cutter Fluted Bits 1-1/8" 18"
48-20-5071 4-Cutter Fluted Bits 1-1/4" 18"
48-20-5090 Thick Wall Core Bit 1-1/2" 3"
48-20-5091 Thick Wall Core Bit 1-3/4" 3"
48-20-5092 Thick Wall Core Bit 2-1/8" 3"
48-20-5093 Thick Wall Core Bit 2-5/8" 3"
48-20-5094 Thick Wall Core Bit 3-1/8" 3"
48-20-5095 Thick Wall Core Bit 3-1/2" 3"
48-20-5096 Thick Wall Core Bit 4" 3"
48-20-5097 Thick Wall Core Bit 5" 3"
48-20-5099 Core Bit Centering Bit

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