12 Inch 1 1/4"-7 Core Drill Bit Shaft Extension Rod for Core Drill Rig Drilling

1. Shaft Extension for Core Drill, for Use with Diamond Core Bits.
2. 1 1/4"-7 Male Thread Fits Core Drill Bits 1-3/4" Diameters and above.
3. 1 1/4"-7 Thread Male to Female.
4. 12 Inch Length.