[ssg]

Dude you spend 10$ total.

Go to home depot and buy a 3/8" socket drive adapter.
Then go walk over to the tools and buy a 5mm hex bit "socket" (even though a 3/8" drive with a 5mm hex bit sticking out of it).

I can take pics if needed, but if you can't find the "socket" , just go to sears and tell the dude you want to drive a 5mm hex cap screw with a 3/8" ratchet. But first spend the 1.99$ on the 3/8" - quick drive adapter at HD.

I have a dewalt 9.6v cordless screwdriver that I use this setup with and it's mint.