Adapter Female 1-1/4″-7 to 5/8″-11 Male.
This is what you need to use those small core bits on your wet core drilling machine.
Most Diamond Core bits under the size 1-7/8″ use this 5/8″-11 female thread. All DRY diamond core bits come with a 5/8″ -11 Female thread.
Converts the 1-1/4″-7 thread per inch FEMALE to a 5/8″-11 thread per inch MALE.