Rightline Gear Anti-Theft Coupler Ball and Lock- The Rightline Gear Anti-Theft Trailer Coupler Ball guards against theft when the trailer is off the vehicle. The Trailer Ball fills the space where hitch balls or smaller towing devices are inserted. The super strong polycarbonate Ball cannot be broken or removed once it is secured in place by a trailer coupler lock. A handy uv protected zip tie attaches the Trailer Ball to the trailer chain so that the Ball is impossible to misplace. The Rightline Gear Anti-Theft Trailer Coupler Ball guards against theft when the trailer is off the vehicle. The Trailer Ball fills the space where hitch balls or smaller towing devices are inserted. The super strong polycarbonate Ball cannot be broken or removed once it is secured in place by a trailer coupler lock. A handy uv protected zip tie attaches the Trailer Ball to the trailer chain so that the Ball is impossible to misplace. Rightline Gear offers the Anti-Theft Trailer Coupler Ball alone or with a Coupler Lock included. The Anti-Theft Trailer Coupler Ball performs better than many trailer security devices that are double or triple the price!