LEDpanel 36 Accessory Holder attaches onto the LEDpanel36 series externally. It allows the user to put accessories onto the LEDpanel36. Slide mounts on the exterior of this holder allow user to mount addtional accessories like barndoors, color/filter frame, egg crates and top hats. It fits accessories with mounting rim dimensions of 12.56" wide x 5.43" high.