Used these on the glass Avent Naturals bottles. I purchased them after we over tightened a few of the Avent lids and they started leaking all over the place. These lids seemed to be easier to hit that sweet spot of tight but not leaking (for us as least). There is an early "tight spot' on these lids so you do need to get past that then they snug up nicely. Purchased these because I didn't see lids from Philips and I am glad I bought these!
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