The keyed alike receiver lock fits both 1/2" and 5/8" recievers, and comes with a stainless steel coupler latch lock. The Push to Lock™ locking mechanism pushes the lock body onto the pin firmly and removes the key. Weather Tough® seal and water tight cap helps protect the lock from moisture and dirt. The stainless steel adjustable coupler latch locks from 9/16" to 2-3/4". Includes a K1 key blank. Best used with automotive, towing, trailers, and marine recreation.