Duro DP-CA Dry Diamond Core Drill 3 Jaw Chuck AdaptorThe Duro DP-CA Dry Diamond Core Drill 3 Jaw Chuck Adaptor fits directly into the core drill. With an A Taper fitting to accept either the pilot drill or guide rod. For extending the reach of the core drill, add either the DP-EXT3 or the EXT3-M.Manufactured from premium-grade steel for maximum strength and durability in the UK.