3 x 3 in 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 lb. It easily secures heavy-duty ball mounts or other hitch-mounted accessories in the receiver tube. It is constructed from high-strength steel and has a rust-resistant zinc-plated finish for long-lasting durability. This heavy-duty hitch pin is made extra-long and has a 5/8 in diameter to fit any 3 x 3 in receiver with a 5/8 in pin hole. It also features an included retainer clip and a grooved tip for easy clip access from any angle.