This is actually a well-enough made bike mirror, and attaches to either handle very easily by means of the cupped plastic piece that fits over a portion of the the handle, with a hook-and-loop strap securing it in place on the handle in a way that doesn't bother the grip, but the mirror itself really needs to be at least somewhat convex to allow for a broader field of view, being far enough away from the rider's eyes that, being simply a small flat mirror, the view to the rear is quite restricted, to the degree a check for vehicles coming up from behind requires moving your head around to take in enough of the view to be assured you're not missing anything. If it is precisely adjusted to give a view to the rear right where you want it to, it can reveal what's there alright, but it still doesn't give a lot of confidence that everything you need to see back there is being seen. Obviously, the cost would go up with a convex mirror instead of the flat glass here, but the relatively low cost for this one really doesn't make up for the lack of view it provides. I have an older convex, wide-angle mirror that's really no bigger than this one, mounted on a cheap little bendable stem that secures to the handlebar, which I wanted to replace with this purchase. I mounted the old one just to the inside of the left shifter control of the handlebar so that its mirror was downward and outward of the handlebar where it was mounted (it wouldn't mount over the grip, just to the metal portion of the handlebar), with the new one mounted to the left handle, so I could compare both at the same time. Aside from the wide-angle mirror showing more of the view to the rear, without making objects appear too small and despite the view to the rear passing very close by the side of my left leg due to the position I had to mount it in, the convex view showed less effect of vibration than the flat mirror mounted on the handle did. So, I'm giving this one to the goodwill store and leaving the old one on. If it helps anyone, the exposed part of the oval mirror proper, inside the plastic frame, is 3-1/4" by 2-3/4" (the product picture shows it standing on end and not how it would appear in its mounted posture); the outermost part of the mirror housing extends to about 6-1/2" beyond the end of the handlebar, or past the end of the handle, when mounted as it should be.
