When I build something, like a cabinet, I drill one piece of wood so the screw is only screwing into the second piece of wood. I have two drills I use one to pre drill and the second drill I use to screw in the screws. Sometimes I also use a different size screw. I'd like to use the Hex impact driver to drill a different size hole for the different size screw. I know everyone uses the hex driver to screw in screws. I hate using the Hex impact driver to drive screws. Many times I drive the screw in too deep with the hex driver. With the drill I can use the clutch to set the screws just right.
I have a set of hex shank drills but sometimes I need to use a drill that is a different size than is in my hex drill set.
I have used my 1/4" chuck to do exactly this. Set it up with a counter sink bit in my impact and leave my drill set up with the bit I'm using to drive the screw and at the clutch setting I want.
I just went and looked for mine to see what brand it is and I can't seem to find it. I bought it because I was running some 1.5" conduit or so through a soffit and used the 1/4" hex chuck at the end of an extension to drill out some plywood blocking my way.
At any rate, I picked mine because it had the smallest diameter of any I could find locally. I needed it to be smaller than the diameter of the hole saw I was using in the chuck. I didn't look into it any further than that. It's been useful but evidently not useful enough for me to keep track of where it is, lol. I do have a Bosch pocket driver with a clutch that I use for driving screws when I don't need an impact so the hex chuck hasn't been needed as much. I've used it in the pocket driver as well when I needed to use it as a drill.