It took me more than three minutes and a lot of hand cramping to get the largest standard key size. The material they are made of is not flexible enough. Once I got the cover on the key I had to force it into the latch as the bottom part prevented the key from being fully inserted. I didn't realize when ordering that half of these were for small keys. I should have been careful. Because they're so difficult to use, I can't recommend them even though they cost less than four dollars.
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