Vialux Half Dome Vertical Mount Mirror - 3 DirectionThis half dome mirror is great for improving security and safety, it can be sited up high giving an overview of an area, or opposite a blind spot to allow a clear view of oncoming traffic. These mirrors not only improve safety when used as a blind spot mirror they can be used to supervise staff or customers by supervisors or shopkeepers These mirrors are three directions offering a 180 degree view of an area. If a four direction mirror is needed then