I have a one-inch handlebar, and it was hard to find bar-end mirrors for anything but a 7/8 inch bar. These adapters do the trick. They're extremely easy to install. I put them in around August of 2017. Now, in February 2018, they're still in place without any problems at all. I've dropped my bike twice (and I'm not proud of that), and while the bar-end mirrors break off, the adapters stay in place, nice and snug. They're excellent.
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