The really interesting point of this key is its size, puisqu'effectivement, it is barely larger than the socket itself with a "handful" of just 6mm high, which fortunately has a groove facilitating its removal from the support.
This small size makes the course very easy to misplace. The manufacturer may have had to consider using a fluorescent plastic! Nevertheless, he thought of all drill two small holes in the handle, just enough to pass a thin strip - not included - to attach to a key ring, for example. (Even if a set of keys dangling on the side of an ultrabook seems not necessarily be an ideal combination). The cap, he is not entitled to this favor but nothing prevents you to remedy a shot mini-drill, if you have one.
From my point of view, then, and provided it takes the distance over time, good pick.