Easy to install, instructor mirros give a wider view of the sides and back of the vehicle, as well as the blind spots! The mirror mounts leave the surface of the side-view mirros free of visual obstacles, thus adding excellent visibility to driver and instructor, without compromising the visibility of the side-view mirrors for the driver. Durable, stainless materials and strong grip. Great for both: Driving instructors and parents who practice driving with their kids! Sold as a set of two (2).