The diameter of the diffusion surface is 24 inches/60 centimeters; A wide range of applications; Creates uniform illumination that allows you to capture perfect images Interchangeable speedring for use on different monolights; Durable metal frame: light and strong; Easy to install The softbox has an internal light shield that allows bounce lighting, resulting in much more diffused light and less shadow Included white diffusers (diffusion panels) give you more choices to control lighting effects The softbox can be used with studio flashes and monolights; Note: Monolight and light stand are not included