Yes, they work quite well for keeping alignment between boards during glue-ups. I've been using them for years and never thought to post about them.
They will, however, sometimes leave stains in the wood if the glue comes into contact with them, so I always fold a piece of wax paper around the wood where I will be installing them to keep the glue and the clip separated, and then I add the clip. Most any stationery store carries these in many different sizes. They are not cheap, but cheaper than the alternative woodworking clamps, and they are re-usable. Once you have a few in your shop you will find many other creative ways to use them too, like for hanging up large printed plans above the workbench, or for holding those 1/2 used pieces of sandpaper between uses. The wire handle loops allow you to hang them from nails in the wall or from a wire or string too.
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