12" Coring Bit Extension 1-1/4" Thread For Concrete Core Drill #14 - DRILL DEEPER! 1-1/4" 7unc Female end fits BLUEROCK Z-1 and compatible drills 1-1/4" 7unc Male Threaded end fits BLUEROCK Wet type core bits as well as other compatible threaded coring bits All metal construction Center bore to allow for wet drilling water flow Total Length: 14” From spindle shoulder to female thread end: 12” The Core Bit is shown for scale and not included with this adapter. Please see our separate listing for core bits and core bit packages.