This tool will pay for itself in one use because most rearview mirrors are tremendously expensive. Many rearview mirrors are designed to come off of the mounting bracket when hit by the air bag. Because of the way they are manufactured, many manufacturers tell you to just grab the mirror and pull it off because there is no way to get anything under it that is strong enough to pry it off. This works well - most of the time. But occasionally you have a stubborn rearview mirror that is difficult to get off, and sometimes you actually pull the head off trying to get the rearview mirror to release from the bracket. With our rearview mirror assembly tool you can put them back together in seconds, and because of the design you can crimp the metal back around the ball so it is as good or better than new.