Designed to render a lock unusable.
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These are used to prevent anyone else from inserting a key into the lock. It comes with 4 keys one kwickset, a Yale, wieser, and a schlage. I have only tried the schlage and kwickset so far, and while they work to do what they are supposed to, they are very scratchy and difficult to remove. I can tell they are scratching the lock interior and should not be used repetitively on the same lock or it will be damaged. If I had known these were "sparrows" I would have just bought them from sparrows themselves.