The Dual-View provides better towing vision than any towing mirror on the market. Two fully adjustable mirror surfaces give you a better view of the road behind and beside you. The large, flat mirror surface provides an accurate perspective of what's behind both you, and the trailer you're towing, while the smaller convex surface increases visibility into the "blind spot" while passing or changing lanes. The fully enclosed mirror head reduces wind vibration and ensures the Dual-View's adjustable mirror surfaces stay right where you set them. Easy adjustable arms fit most vehicle applications with no tools needed to install. Per each.