Oh, I see. You just need two more handles. Not sure those Tekno tools are even made anymore? So to find a different handle that fits those bit might be a bit challenging, since I'm guessing not many of the sets will list that dimension. Anyway, good luck.
I have had these Dynamite drivers for 7+ years now, and they still look like new. Even with them being used on RC stuff, my 3d printers, and a number of 3d printed projects, they show absolutely no wear at all.
Dynamite Machined Hex Driver Metric Set Red DYN2904 Hand Tools Misc...