The StudioKing Standard Reflector SK-SR18 is an 18 cm diameter reflector suitable for studio flash units with a Bowens/Linkstar bayonet connection. With this reflector SK-SR18 you limit the angle of the flash light to approximately 55 degrees, giving you more control over the direction of the light. This is an important feature because it prevents the flash light from going in all directions and thus a lot of light would be "lost.