This does exactly what it's supposed to. Installation was a snap with the built-in screws on my bike. The bottle pops in securely and stays put.
It's made of plastic, and the plastic is a little thin, so I'm a little worried about long-term durability, but so far so good.
From the picture I thought the front was solid, so I wasn't sure how the bottle would go in, but the "arms" don't meet, so they open as you shove the bottle in.
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