BicycleStore&reg; 2 Pcs 360&deg; Rotate Adjustable Universal Handlebar Rear View Mirror For Bike Bicycle Cycling Black Riding don't look back behind the situation, provide riders safe practical rear view option . Light weight, large lens, scratch resistant.Fast install and remove by adjusting screw. Fit for most bike,handlebar diameter is about 22mm.Item Size: 22"8"8cm.Mirror Diameter: 8cm. Adjustable to 360 degree.Make you safer when riding on the road. With reflector on the back,round shape.