This is a Profoto 10° Honeycomb Grid that will fit a Profoto Grid Reflector.
Grids are essential accessories for any lighting system. A grid alters the shape and intensity of the light output from your light when it is mounted on a reflector or holder. Consider a grid as a painter would a brush, or a sculptor would a knife, or chisel.
Use of a honeycomb grid will result in a narrower spread of light. The spread of light will be determined by the density of the honeycomb mesh, and the distance of the subject from the light.