Designed for comfort and convenience while working on set the progrip is designed to mount an off camera speedlight with the option of also carrying a radio trigger and light modifiers from umbrellas through to small softboxes ancillaries are attached via the two cold shoes and umbrella mount while the base of the grip features a 14 thread should you wish to secure the unit to a tripod all told its a comfortable practical and versatile of carrying and utilising off camera flash