Possably more than you want....
This kit is sold under several brands, this one is the ProSource??something or another that is Walmart generic tool brand. The compartment in the bit driver will hold 1 of the 6 bit holders, or if you ditch the holder you can stuff 18bits in it with a little shaking. Downside for US is it is mm.
As you can see the driver is about the same size as a 111mm SAK
The second pic is a smaller aluminum driver that holds 7 of the same 4mm bits, but unfortunately doesn't have hex so you would need to refill it from another kit to fit your needs. These drivers are found branded under random names. Be careful and make sure the one you puck up has the magnet still in it as they ocasionaly dont and have no bit retention without.