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CDA-40 2in (51mm) Expander Set for Open Head Drill Bits is required to connect 2in (50.8mm) Concrete or Asphalt Open-Head Core Drill Bits to an electric or gasoline-powered Core Drilling Machine. The Expander Set fits into the open end of Open-Head Coring Bits and threads onto core drills. The Expander Set can be reused multiple times as coring bits wear out.
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