Description: Application: Designed to fit 2 5/16 inch or 2 inch (optional) trailer couplers, this hitch lock accessory is fit for a wide range of vehicles, ensuring secure towing across various models Heavy-Duty Trailer Lock: Its important to do everything you can to protect your belongings and your boat or trailer from being stolen. This strong coupler lock fits select 2 5/16-inch trailer couplers and will keep your vehicle or boat secure Tough RV Lock: Our lock uses a solid stainless steel locking pin encased in a ductile iron shell for increased security. The exterior cover has a powder-coated finish and is tough enough to stop burglars from using bolt cutting tool and crowbars on your lock Unique Key Design: This boat and trailer lock has a special key design that avoids anyone from picking the lock. Our innovative key system also features an interior locking mechanism that stop would-be thieves from making a copy of your key Trailer-Coupler Lock: This lock will only mount on specific 2 5/16-inch (or 2 inch optional) couplers. Check the coupler sizes that are compatible with our lock hardware to ensure that the lock you select matches your trailer coupler Specification: Material: Iron Size Chart: Fit 2 5/16 inches Couplers: 14.8cmx8.86cm/5.83inchx3.49inch or Fit 2 inches Couplers: 13.6cmx8cm/5.35inchx3.15inch (optional) Package Includes: 1Trailer Hitch Lock Set Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.