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The first time I saw this thing it was marketed as something to hold a pair of eye glasses on the front of a shirt if you don’t have a pocket. One half goes on the inside of your shirt and the other goes on the outside. They’re held together, in place, with really strong magnets.
That goes in your rain gutters downspout opening to keep the leaves from clogging it up.
https://a.co/d/9ab2JKR