Each of the handles on my multi-bit drivers end up being a little bit different from the other.  However, each is made with a #2 magnetic shank.  Which means you can use any #2 sized hexagonal bit you have.  Ships with basic 6 piece flat and phillips head bit set in a magnetic wooden retainer.

If you would like something made out of a special piece of wood or in a particular shape, send me a message and we will work something out.