Yaheetech 360 Degree Bike Bicycle Cycling Wide Angle Side Rearview Rear View Mirror for Handlebar Suitable for mountain/road bikes and more 360 degree free rotation for any viewing angle Durable and stylish ABS construction, anti-scratch Fits bike handles bars with an internal diameter of 19mm Dimension: 5.61.81 inch (LWH) G.W: Approx 0.13LB