(1) 6" & (1) 12" CHROME CORE BIT SHAFT EXTENSION. EASILY ATTACH TO A CORE BIT AND ALLOWS FOR A DEEPER DRILLING CAPACITY.
May come with Black oxide coating. The black oxide process is a coating that is applied to steel, usually with a thickness of 0.001 inches. It does protect against rust.
KEEP THREADED AREAS GREASED FOR EASY REMOVAL FROM DRILLS AND CORE BITS.
6" & 12" Core Drill Bit Extension 1-1/4"- 7 Male to 1-1/4” - 7 Female