The Gel Holder is designed to attach to the magnetic mounts of compatible fixtures. This is a versatile, two-part accessory that serves three different functions. 1) It can easily hold a gel in between the two parts of the holder. 2) It can act as a dome diffuser extension when working with softboxes, beauty dishes, or other light modifiers that require a soft, enlarged reach of light. 3) It can also be used as an extension for a fresnel lens, allowing you to further spot the beam angle for even greater control of the light output.