The Milwaukee® 3-1/8" 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).