Since there are no other reviews yet... this mirror is junk. Junky junk junk. I've gone through multiple mirrors, as I ride thousands of miles a year and occasionally I do drop a bike, and most mirrors have some kind of mechanism to secure them to the bar. Not this one. The only thing holding it in is the rubber plug, and it does not do so very well. I've tried both inserts it came with, and my handlebar opening is within the range stated in the description. The mirror rotates around and slowly backs out. It's a source of minor frustration while riding.Most mirrors cost at least 2-3 times this much, but they're ten times better.