The REESE Towpower Class V Dogbone Receiver Lock barrel-style trailer-hitch receiver lock handles most heavy-duty jobs with ease. Designed with a 3.5 span for 2.5 square tube receiver hitches, the REESE Towpower Class V Dogbone Receiver Lock secures Class-V ball mounts with a 5/8 receiver pin hole. A built-in push-button lock mechanism makes it easy to secure, and a durable rubber cap keeps dirt out of the lock area for long-lasting reliability. The attractive chrome finish adds style to match the ultra-strong performance, making this REESE receiver lock the ideal addition to your trailer accessories. For use on 2.5 square receiver openings. Includes 2 keys.