This is their clip on style version and the overall length of this mirror is 11-3/4 inches. We will go ahead and flip it on our factory mirror and show you how it works. How this installs is pretty simple, it just clamps on and these clamps here on top are spring loaded. It allows a lot of adjustability depending on how thick your mirror is. That pretty much holds it in place and it also has these little detents to help lock in position so you can tilt it up or down. To install it is pretty easy, the best way to do is to just go ahead and put it over the top edge and pull the latches down and let it fall back in place. Also what is nice about this is that the detents let you to take it and tilt it down as needed. As you can see you can get a wide angle view of everything. It is especially helpful on the outside of your vehicle in the blind spots. Also with the mom and dads out there with SUVS and minivans with all the kids in the back, you can keep an eye on all of the kids really easily with this mirror. So that gives you two functions in one. There you have it for part # 34000 from Cipa.