The iFlight AOS 7 EVO 7" Frame Kit is perfect for freestyle drone racing. Constructed with 8mm arm thickness for superior durability and reliability, the kit features 25.5x25.5 or 20x20mm stack mountings in the front, center, and rear. It fits the DJI O3 Air Unit, Caddx Vista, or HDZero Freestyle VTX and both 20mm (DJI and O3 camera) and 19mm (micro-sized) cameras. Standoffs, frame, and screws are included.