I bought this for a three prong plug and it does exactly what it's supposed to do: locks the plug so it can't be used. The third pin slides easily over the outside of the lock, so that's not a problem. Turning the lock with the supplied keys isn't as smooth as turning a door lock, for example, but it works and I have no complaints. This lock appears to be of simple construction, so I don't see any durability issues.
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