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-Adapter from 1 1/4 to 1/2 BSPP sleeve. Coolant flows through the hole in the adapter to the hole saw. -The 1 1/4" internal thread enables mounting on any machine with a 1 1/4" external thread. That means most diamond drilling machines. -The 1/2" BSPP external thread allows us to use core drills that we normally would not mount on the machine. -This small, compact adapter will help us expand the capabilities of our core drilling machine with additional applications. -The adapter has tabs on the sides. These are used to unscrew the adapter with a spanner.