Tonight I installed a towel hook in my bathroom. Like many such modern decorations, it is equipped with a hidden plate that you affix with screws to the wall. Then the decorative plate is fitted over the plate and fixed in place with an allen (or hex) screw.
And they very helpfully included the correct sized allen key for me to use.
My pile of "single-use" allen keys is growing. Ikea includes them with their knock-down furniture. They come with the mirrors or other gizmos I buy to mount on my bike. These bathroom fixtures come with them, and on and on.
So why is it that all these manufacturers assume that you have a screwdriver, but they never assume that you have a set of allen keys?
...art