Bought these for our 2 cots because they have wooden slats to support the mattresses and we've tried everything else. The cot came with an attachable side rail but it wasn't big enough and my 2 year old kept falling out. They work great. The other side of the bed rests against the wall, and there are straps I tied around the bed frame to keep it stable. It raises the mattress an inch and then the slats which I would have liked but these slats were the only ones that would fit the crib I found after buying 3 different types. They have enough room to get in and out, but won't fall out.
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