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These parts (there are two mirrored antenna mounts) are intended to be used with the ZMR-250 frame as modified with hexagonal 20mm standoffs. The mounts provide points to connect antenna tubes to direct the antennae of the Frsky D4RII at 45 degree angles from horizontal as well as two lugs that can be threaded with an M3 tap to attach a Banggood LED lightbar (http://www.banggood.com/LED-Decoration-Board-Strip-3S-For-QAV250-Quadcopter-p-951108.html). Please note that the spacing for the lightbar is only accurate with the ZMR-250 standoff spacing. While it may work for other frames or lightbars, I can't guarantee that it will.