PDW says.... Install the Watch Your Back XL mirror on your handlebar, open your mind's eye, and flow through traffic with heightened clarity. This large mirror is perfect for e-bikes and commuting rigs. 

Bikemonger says.... Excellent plus size mirror, big enough to do your make-up in at traffic lights. Being of American extraction it's designed to mount of the left side of your bars. However if you don't mind looking at bolt threads rather than bolt heads, or you mount it slung below your bars, then it works fine on the right too.

Fits 21-26mm diameter handlebars
HD Glass and nylon body
170 g
96mm diameter mirror