3" x 3" receiver hitches are built for towing heaviest of trailers, and a hitch pin with the proper size and rating is essential for safe towing. This heavy-duty hitch pin has been stringently tested at our Detroit engineering facility to safely tow 21,000 lbs. It easily secures heavy-duty ball mounts or other hitch-mounted accessories in the receiver tube. This heavy-duty hitch pin is made extra-long and has a 5/8" diameter to fit any 3" x 3" receiver with a 5/8" pin hole. It also features an included retainer clip and a grooved tip for easy clip access from any angle.