The Master Lock No. 3794DAT features a trailer coupler lock, receiver lock and trailer coupler latch lock. The trailer coupler lock fits 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) 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 9/16in (14mm) to 2-3/4in (70mm) for added application flexibility. The Limited Lifetime Warranty provides peace of mind from a brand you can trust.