Though I don’t attach this to my key chain, the concept is the same. I do I.T. support for a company and put together this pocket kit. I also carry a pocket knife and the combo seems to meet most of my needs.

The little screwdriver is a Thumbprint 4 in 1 Screwdriver. Each bit is double-ended with a Phillips one one end and a slotted on the other. You can see that the bit that is not being used is stored in a hole cut in the handle. I found it on eBay.