This is a bit holder for the DCF850 impact driver but might fit many “newer” Dewalt impact driver and drills that support Dewalt Tool Connect chip.  Unfortunately, since this holder fits in the Tool Connect chip location, it is not compatible with the Tool Connect system.  Original cover screws should be used.

PETG is recommended for optimal performance.

This holder is based on the mcmbrown211 model that I use since a while on my impact driver.  Unfortunately, it is not compatible with the newer Dewalt models since the screw for the tool holder has changed location.  I designed this one that replaces the Tool Connect chip cover so it holds strongly to the tool.