1. Installation size - suitable for 13-14mm inner diameter (thick-wall handlebars) and 17-19mm (regular handlebars) direction to 22mm handlebar diameter. 2. Commodity material - Mirror glass The surface of the mirror rod is anodized with high density aluminum alloy. 3. Applicable models - scooters, Harleys, street cars, sports cars, electric cars. 3. Clear Vision - With white clear glass lens, it provides high definition and wider viewing angle both day and night, easily seeing the upcoming cars and obstacles. 4. Basic Features - This rod end mirror improves driver awareness and visibility and eliminates blind spots by allowing the driver to see the vehicle and conditions behind him 5. Best Vision Position - Set the left mirror to see whats behind you, and set the other mirror to whats in your rear three-quarter field of view.