4" Countersink Drill Bit for SDS-Max Rotary Hammer Drill

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4" Countersink Drill Bit
Save Time, Labor & Money Setting Berntsen 4" Concrete Markers

"The countersink drill bit we purchased to install Berntsen concrete markers works PERFECTLY! We scheduled 2 days labor and ended up only using about 5 hours. It's very handy, still in great shape and paid for itself the first time we used it." - Jake Teegarden, Vasconcelles Engineering Corp., Springfield, IL

The C4DRLM countersink drill bit is used to install Berntsen 4" concrete markers in asphalt or concrete. Use the C4DRLM to ream the proper counter sink depth, then use a 1" bit to expand the hole for the marker stem (item # SM-420-420 sold separately) for a neat looking, long-lasting recessed monument.

  • For SDS-Max rotary hammer drills only
  • This drill bit countersinks the top of the marker only (not the stem). We suggest a 7/8" or 1" drill bit to create the stem hole (item # SM-420-420 sold separately)
  • Three-piece design - No longer necessary to replace entire bit when one section wears out
  • Berntsen recommends at least a 24-volt Rotary Hammer drill be used with these drill bits


Fits an SDS-Max Chuck
For use with C4D & C4DB
Berntsen Concrete Markers

Pilot Bit - 5/8 x 4 3/4
Drill Depth 2 1/8

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Countersink Drill Bit Video for Berntsen Concrete Markers


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