They hold my 20 oz (592 ml) bottles securely even though the bottles are a different shape. They come with some good quality corrosion resistant stainless steel bolts/washers, although you probably already have some of these supplied with the bike. They're super stiff in the attachment area, and the thin and flexible handles are just enough to grab your bottle. I can't imagine these things breaking apart in an accident and your bottle not detaching even if you lube it with chain lube. See my attached photos.
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