Disappointed to see threaded fasteners are nylon and not something more durable like metal. The fit could be better and the mirror is smaller than the OEM truck mirrors, and subject to vibration. Mounting the mirrors was not as smooth as described. Starting the knob on threaded hook is subject to cross threading. The threaded portion of the hook needs to be longer with an opening in the knob for pass through when tightening. Otherwise they are nice.