This is a Delta 5° 7-1/2" inch honeycomb grid. It provides a beam spread of 5° when mounted on a reflector that accepts grid spots.
Delta provides various sized lighting accessories that will function with your flash heads, at a considerable savings over original name-brand devices. Grids are essential accessories for any lighting system. These devices alter the shape and intensity of the light output from your flash heads. Use of a grid will result in a small circle of light, when it is attached to the front of your light source. The size of the circle of light will be determined by the density of the honeycomb, its thickness, and the distance of the subject.