Dquad Store › Fixation Main Plate-30x30 and 20x20 Fixation Main Plate-30x30 and 20x20 $5.75 Stock main plate that accommodates 30x30 and 20x20 flight controller stacks. Includes four sunk nuts installed. Stock main plate that accommodates 30x30 and 20x20 flight controller stacks. Includes four sunk nuts installed. Quantity: Add To Cart Added!