NOTE - 5/6/16: At this time the manufacturer is unable to deliver the product. We are hoping later this year issues are resolved and we can once again offer the product for sale.Keep your trailer coupler and safety chains protected from theft, even if subjected to crowbars or sledgehammers! The Proven Industries 2178 coupler lock fits most 2" and 1-7/8" couplers. It has a 1/4" hardened steel construction with a powder coat finish, which prevents corrosion. Includes outside shield and interior slide. Both components are robotic tig welded and CNC laser cut for a precise fit. Using a simple three part system, this lock secures not only your coupler, but your safety chains as well. The inner slide features alignment tabs to ensure a proper fit with the outer shield. Includes Proven Lock & keyed differently puck lock