The Rightline Gear Anti-Theft Trailer Coupler Ball guards against theft when the trailer is off the vehicle. The Trailer Ball guards against trailer tow-away by filling the space where hitch balls or smaller towing devices are inserted. The polycarbonate ball cannot be broken or removed once it is secured in place by the trailer coupler lock. The lock is designed so that bolt cutters cannot be used on it. A handy uv protected zip tie attaches the Trailer Ball to the trailer chain so that the Ball is impossible to misplace. The Anti-Theft Trailer Coupler Ball and Lock performs better than many trailer security devices that are double or triple the price!