perfectly useful for…
…nearly all kinds of sport
as a hook for gear in general, for drinking bottles (camelbak, nalgene), for hiking, to attach things to your backpack, for divers, for fitness gear, for fishing, skitouring and a lot more.
…hobby, travel or in general your leisure time
for hammocks, as a hook for all kinds of gear, as a photographer especially nature/animal photography, action sport photography and movie making. Or just in general for transporting things
…house, garden and in the family
at the baby buggy rattle-free without sharp edges, for camping, dog leashes, swings, as a keychain or simply as useful allround all-purpose present.
But not for climbing!