I purchased this mirror to use in my work van, which has no side windows in the cargo area. Consequently it can be impossible to see certain angles when pulling out of parking spaces, driveways, alleys, etc. I placed this mirror on the inside of my windshield on the passenger side, and now I can see just about perfectly at the angle I need. It falls off once a month or so, but fortunately seems pretty sturdy. I just stick it back on and it's good.