1 1/4" FEMALE  TO 5/8" MALE CORE BIT ADAPTOR. MANUFACTURED FOR INDUSTRIAL USE. MADE WITH STEEL COBALT AND MAGNESIUM, THIS PRODUCT IS GUARANTEE NOT TO FLEX OR UN-THREAD. 

For use on core drills with 1 1/4" thread.

USE A DRY CORE BIT ON A WET CORE DRILL

Adapter easily attaches to dry core bit to convert 5/8"-11 male arbor to 1-1/4” - 7 threaded female arbor

This adapter has a hollow center to allow for water flow if desired