Experience an extra measure of security when you ride with this adjustable, wide-view mirror. The High Definition Glass Lens provides a superior view of approaching vehicles. Quick, simple, external attachment to left side, flat handlebars. Mounts to hybrid, commuter, road, mountain or recumbent bikes. - Fits bar diameter 21 to 26mm - Quick, simple, external attachment to left side, flat handlebars - 4.125-inch high-definition glass, wide-view mirror provides a superior view of approaching vehicles - Nylon frame and body - Oval mirror rotates 360 degrees