A simple tool, but that will delight glasses wearers

Available as key door, this little tool is not complicated though: two mini screwdriver bits (flat and starred) and a tip for mini hex nut, or in general all the screws and bolts that can be found on a pair of glasses.
What a spectacle wearer has not found one day with a removed branch or nose support that too dance after its support?
With this little tool, no more worries.
For cons, I do not guarantee that the chain will hold a very long time and do not hurry to receive it, it is sent to China!