The XTENDER® (XL-MM-20) Dual Tightening Monitor/Light Attachment will attach to any 1/4"-20 female threaded fixture. Plus, it will lock into the upper arm of the XTENDER® so that you can attach a 1/4"-20 accessory such as a Zylight, Lite Panel, Zoom, Nano Flash, Small Monitor, etc... The dual wheels will allow you to tighten both ends of the stud to your accessory and your camera.