The largest prize that can comfortably fit inside a standard toy crane machine is typically a plush toy or item with dimensions around 12 to 16 inches (30 to 40 cm) in its largest dimension. The exact size depends heavily on the specific model of the crane machine, as cabinet dimensions vary. Most common arcade-style cranes have a glass front and a prize drop chute that limits the maximum size. Prizes must be able to pass through this opening, which is often the main constraint. Generally, a large, soft, and slightly compressible plush toy stands the best chance. Overly wide, long, or rigid items will likely get stuck. To maximize your chances, look for prizes that are large but not bulky, and positioned in a way that the claw can get a good grip. Remember, the crane's claw strength and opening width also play a crucial role in successfully retrieving a larger prize.