An adjustable height corner fitting for a shipping container including a substantially hollow rectangularly shaped block having a bottom wall, end walls and side walls is disclosed. An elongated aperture is located in the bottom wall and is adapted to cooperate with a locking mechanism in order to lock the shipping container to the platform of a vehicle. Also provided is a substantially rectangularly shaped plate that is complementary to the bottom wall and is adapted to be temporarily attached thereto in order to increase the height of the block. The plate also has an elongated aperture therein which is complementary to the aperture in the bottom wall. When the plate is attached, the apertures in the plate and in the bottom wall are in alignment, but the plate causes the corner fitting to extend downwardly approximately a half an inch below the container for shipment on a truck, boat or rail car. With the plate removed, the bottom of the corner fitting is essentially flush with the bottom of the container thereby allowing the container to be transported by cargo plane.