Toolocity Ad1112 Concrete Core Bit Adapter
C$39.95
Concrete Core Bit Adapter - 5/8-11 to 1/2in Shank. Transform 5/8in-11 female arbor to 1/2in triangle male shank for concrete core bits.

1/2-Inch Shank
longer threads
5/8-11 threads

FREE shipping in both Canada and the US.
New in open package. Tested and guaranteed to work.