DJI O3 Antenna Locking Bar Replacement for anyone who's lost one you know the pain, 3 versions, 6mm for stock length bolts and thicker versions if you have longer bolts. The bolts are M1.6 aka 1.6mm wide and 6mm long. I recommend using one of the thicker versions it'll hold better. The stock locking bar also has grounding pads that touch the UFL and they might be important for signal integrity i really don't know.