The Chuck Liner installation tool is used for installing new chuck liners into the S58F7DA Chuck Driver, and removing them. This tool will require a press in order to press the chuck liners in and out of the chuck driver. For use with both 1041277 (7/8" x 4-1/4" Hex) and S58F7TLF (1" x 4-1/4" Hex) Chuck Liners.