The amazing EDC-Key by Maratac™ was developed by EOD Robotics in 2008 for use by military robotics repair technicians.
I love this little EDC screwdriver. Everything is tight and won't come apart on its own. The bits are fantastic, and I highly recommend buying a few spares. You can even chuck this into a drill, because it's essentially a 1/4-inch bit holder with a plastic wing to give you leverage to turn a screw. Overall, it's a great tool and I plan to purchase some for Christmas gifts.
Turns 1/4 hex bits or extensions into essentially a key chain/pocket tool. Nice product, fits snug, works as designed.