Spring latch rearview mirrors have a small spring inside the bracket that is pushed down as you slide the mirror over the mirror button which then springs back into place, locking the mirror in place. Because this spring is hidden, it is difficult to release. Designed for use on Ford vehicles built after 2004. Made of high-impact plastic. Removal: Place the tool at the bottom of the mirror base, flat side against the glass, and push the tool into the opening, compressing the spring. Then simply slide the mirror off the mirror button.