06J1904 - 1/2" Shank Bit Holder
If you already own the 3/8" Strongbore bit extension, this adapter allows you to also use 1/2" shanked bits with it.
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause Reproductive. For more information, go to www.P65Warnings.ca.gov (opens in new tab).

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1/2" Shank Bit Holder for Strongbore Extension
If you already own the 3/8" Strongbore bit extension, this adapter allows you to also use 1/2" shanked bits with it.