This is a Dynalite 7" Snoot, used to create small circular ring of light and control light spill. It fits on the Dynalite SR65 reflector, which fits on the 2000 and 40 series heads, and Uni400Jr and Uni250R monolights. It also fits the Comet 7" reflector. If you purchase the grid spot adapter, this snoot will fit on the RH1050 and MH2050 flash heads, as well.
Snoots, Barndoors, Grids, and Filters are essential accessories for any lighting system. These devices alter the shape, intensity, or color of the light output from your flash heads. Consider them as a painter would a brush, or a sculptor would a knife, or chisel.
Use of a snoot 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 opening of the snoot, its length, and the distance of the subject.