Curious if the Dewalt DW2542 adapter is any shorter than a Milwaukee, those I have in 3/8 and 1/4 sizes. Approx 2 inch total length.
I also have the Tekton nut drivers. Too bad with those they are limited to the maximum sizes of 7 1/6 and 12mm. They are by far the shortest of the hex shanked nut drivers I've seen. The 7/16 is only 1 1/4 inch long when installed. The Milwaukee adapters extend out to 1 3/4" with a 7/16 shallow socket (craftsman) and doesn't matter if its the 1/4 drive or 3/8 they end up both the same.
Just some FYI's here using those tekton nutdrivers several of them will not lock in my older Milwaukee M12 2462 impact driver. I think it's the 10mm and 7mm for what it matters. They will lock in the Fuels both 12v and 18v but only if you raise the collet when installing them...opposite of the way its supposed to work and for some reason they wont catch with the push insert. All of them work just fine with my 1/4 hex drive screwdrivers.
You can lock in a standard 1 inch bit with the Milwaukee's Don't know if it is that way with other brands too. Bit needs to have the groove around it. Makes a very slight countersink in drywall when setting screws
Maybe I will try notching a groove in a very short 1/4 socket adapter.