The Rotolight Aluminum Barndoors for NEO are used to shape and control the light output from your Rotolight NEO and help limit spill. This allow you to direct the light to areas of your subject that you would like illuminated as well as keep light off areas that you don't want illuminated. The barndoors feature a 4-leaf design and folds flat against the NEO for easy storage. Thumbscrew mounting knobs for attaching the barndoors are included.