If you're riding a Wilier Izoard road bike, then this is the replacement derailleur hanger that you'll need in your spare parts bin at home. Accidents happen. We all know that. And as a somewhat vulnerable area of the bike, these little bits help deflect impacts when your bike goes down. The point of it all is that this is an inexpensive part and it will likely save your frame from damage. It comes with new fasteners, and installation is easy enough to do in a few minutes.