Product Features 100% brand new and high quality. 360 degree rotate help you watch every direction of you back. Sometimes treat it as a mirror to check your face or cloth. Fast install and dismantle by a adjustable belt. Fit for handlebar with 25mm-55mm internal diameter,most bicycle can be used. Mirror Dimension:2.5" L x 1.7" W(70 x 50 mm). Necessitiy for bicycle rider. Package Includes 1 x 1 pair Handlebar Rear view Mirror.