The Master Lock® 3794DAT features a trailer coupler lock, receiver lock and trailer coupler latch lock. The trailer coupler lock fits 1-7/8 in (48 mm), 2 in (51 mm) and most 2-5/16 in (59 mm) couplers. 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 coupler latch lock adjusts from 9/16 in (14 mm) to 2-3/4 in (70 mm) for added application flexibility. The limited lifetime warranty provides peace of mind from a brand you can trust. Master Lock® Receiver and Trailer Coupler Latch Lockset, Keyed Alike Universal, 1/2 in, 5/8 in Diameter Hole, Stainless Steel, Black