Reese Towpower Elite Towing Receiver Lock, Black Nickel: * Sleeved, dogbone style receiver lock * Designed to provide safety and prevent theft of the trailer hitch ball mounts * Features a sleeved pin to fit either 5/8" or 1/2" hitch pin hole sizes * Push button lock mechanism * Rubber cover to keep the lock clean and protected * Square key design is virtually pick-proof * Model# 7039030