Core Bit Adapter 5/8"-11 Male Thread to 1-1/4"-7 Female Thread
This adapter works great for using smaller diameter core bits threaded at 5/8"-11 on a core drill machine threaded at 1-1/4"-7. This adapter is usually required when using under 2" in diameter wet core bits or all the size of the dry core bits that have the 5/8"-11 female threaded.