... off.3.More widely fit most bicycle,diameter 15.5mm-22mm,all fit is good.4.Durable NYLON plastic,more safe,more ... )more widely adjustable(360' rotate)more widely suitaable handlebar,mostly bicycle handlebar(16mm-22mm).more widely field of vision(field of ... vision increase to 20%)bicycle mirror,bike mirror,flexible mirror,rear mirror,handlebar end mirror ...