Master Lock 1479TAT Receiver Lock, 2 Pack The Master Lock 1479TAT features two 5/8 inch (16mm) 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 water tight cap provides additional protection from moisture and dirt. The limited lifetime provides peace of mind from a brand you can trust. Class III/IV, 10, 000 pound load rating. Features Fits 5/8in (16mm) receivers Usable length of receiver pin is 2-3/4 in. (70mm) Push to Lock locking mechanism - push lock body onto pin firmly and remove key Weather Tough seal and water tight cap protects lock from moisture and dirt Class III/IV; 10, 000 lb. Load Rating.4-pin cylinder for added pick resistance.Same key opens both locks; K1 Key Blank USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.