Weigh Safe Trailer Coupler Ball Lock — push-in coupler lock with hardened steel dual shank for theft prevention. Features: - Sleek & solid design made of air-craft grade aluminum and hardened steel - Easy push-in lock - Both locking member arms lock in place for improved theft prevention - Dual-use lock: simply flip the ball plate over to use as a lock for other applications (e.g. a bike lock) Official Weigh Safe MAP pricing.