Birds Eye mirrors fit over the factory glass. Aspherically bent, this mirror expands your field of vision up to three times from 16 degrees to a full 40 degrees making everything from lane changing to parking much safer. Made with an anti-glare glass (reduces night glare by 55%), its breakthrough technology provides stepless vision without double image distortion. No tools, no hassles, just peel off the backing and apply. The strong adhesive strip provides a solid hold.