Trailer lock combo set, receiver lock & trailer coupler latch lock, coupler lock fits 1-7/8" 48 mm, 2" 51 mm & most 2-5/16" 59 mm couplers, receiver lock includes the push to lock locking mechanism, easily used by pushing the lock body firmly onto the pin & removing the key, fits both 1/2" 13 mm & 5/8" 16 mm receivers, latch lock adjusts from 9/16" 14 mm to 2-3" 70 mm for added application flexibility, keyed alike, coupler lock fits 1-7/8" 48 mm, 2" 51 mm & most 2-5/16" 59 mm couplers, push to lock receiver lock fits both 1/2" 13 mm & 5/8" 16 mm receivers, latch lock fits most couplers & is adjustable with 6 locking positions from 9/16" 14 mm to 2-3/4" 70 mm.