I carry a small unobtrusive, unthreatening, knife into my uptight hoplophobic work environment. The one on the left. "That's a weapon!" Please! If I need to kill someone I'll use my bear hands before going for the mini Skeletool.
That's the one I usually go to. For a placid workplace. But it's not the only one I have, necessarily. What if I need a real screwdriver? Or pliers? Hence the middle one might or might not be handy. On my person. Maybe.
The scanner doesn't have very good depth of field, but yes those are 1911 grips on the one on the right.