The Master Lock® No.1479TAT features two 5/8 in Class III/IV Barbell™ receiver locks, keyed alike. The receiver lock includes the Push to Lock™ locking mechanism, easily used by pushing the lock body firmly onto the pin and removing the key. The Weather Tough® seal and watertight cap provides additional protection from moisture and dirt. The limited lifetime warranty provides peace of mind from a brand you can trust. Master Lock® Trailer Receiver Lock, Barbell