This fifth wheel to gooseneck adapter allows your gooseneck trailer to be towed by a fifth wheel hitch. The adapter has a solid 2" forged kingpin with a 1/2" bolster. This one-piece hardened steel 3 inch ball is machined to the kingpin and is rated for 31,000 lbs. Product is unpainted so some surface rust may be present when received. Please note: Sometimes if the trailers gooseneck is offset you may need to block your fifth wheel plate to keep it from tiliting/articulating. You may also have to adjust the main post of your gooseneck trailer to allow the trailer to ride level.