The Master Lock #2866DAT features 1/2 in (13mm) and 5/8 in (16 mm) Swivel Head? receiver locks. 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.