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What's the question? The holes on the back of the outlet are for inserting the wire and to release it so you can pull the wire back out. There should be a round and a rectangle one for each side terminal. They only accept 14 gauge wire, not 12 gauge. Older one would accept both, but not for several years. Wire goes in the round hole and you insert something such as a small nail in the release hole and push in and then pull the wire out.

The outlet will have a strip gauge on the back if the holes are for self holding lugs, and a square or round release next to the hole.

You don't have to hit the release when inserting wire,only removing it.

If the outlet is rated 120v, 15 or20 amp,it will hold 12ga wire.

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Q: What are the holes on the back of the outlet?
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