Check out this Flush Mounting Trailer Anchor. Features a D Ring style that allows the ring to flip, giving the user easy and flexible usage for tie downs and equipment hook up. Great for utility and enclosed trailers of all shapes and sizes. Maximum breaking strength of 1200 pounds and safe working load of 400 pounds makes it suitable for all kinds of jobs. Product specs are 1/4 ring x 3 1/2 in wide x 5 inches long.
