This is a 60 degree honeycomb grid attachment for the front of a Interfit Pro Monolight with the standard 7inch (13cm) reflector. Grids are essential accessories for any lighting system. A grid alters the shape & intensity of the light output from your softbox when it is mounted on a light head. Consider a grid as a painter would a brush, or a sculptor would a knife, or chisel. Honeycomb grids & "egg crates" are rigid, or semi-rigid. Fabric grids are h&-stitched, & collapse easily for storage or transport. Use of a fabric grid, honeycomb grid, or "egg crate" will result in a narrower spread of light. The spread of light will be determined by the density of the honeycomb mesh, & the distance of the subject from the light. Unless specified otherwise, a grid mounted on a softbox will limit the spread of light to 40 degree; from the face of the softbox.