At something like 27 cents each, these clips cannot be expected to do any heavy-duty work. I was looking for clips that could be used to attach a cell phone case to a belt loop on jeans, or for key clips inside tote bags. I certainly would not use these plastic clips for any "outside" application; the plastic is very light and will not stand up. For inside a tote bag, they could work, but the spring action is clunky. Another reviewer reported that several of the clips didn't have any spring action. In my package of 6 clips, only one had no spring action. If there's no spring, the clip part is really not of any use.
On the other hand, these clips are exactly as described in terms of size, and they do come with a split key ring that is metal. I think they're OK for hanging on a peg board to identify single keys. Any application that doesn't depend on the spring clip would probably be fine. If you need a clip, it's better to go with the all-metal versions that are available. They cost more (over a dollar each), but they will last a while.