I bought two packs of four because I need to hang a set of frames with a triangular hanger (see attached photo). A few other reviewers have mentioned how versatile they are not only for sawtooth hangers, but they don't really work for a triangular style unless you have a pretty big angle at the top. In order for them to work with triangular brackets, you need the much more expensive "universal" brackets, which are made of metal and can also hold wire brackets. These flimsy plastics are far too expensive for what they can do - they need to be a third cheaper, or at least be shaped differently to work with a wider range of hangers. I'm sure most people don't want to stock a huge variety of hangers just because the universal hangers cost 2-3 times more. NOT RECOMMENDED.
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