The TowSmart Quick Latch Trailer Coupler Safety Pin secures your towing equipment and protects your vehicles and other valuable assets from theft. The high-strength safety pin easily keeps your trailer coupler latch engaged with the trailer ball. Simply clip it on to the end of the pin after you've inserted the pin in the coupler latch. The square retainer clip is made with spring steel and is semi-flexible for easy operation. The pin's retainer clip ensures the pin will not vibrate or rattle free. Made of corrosion-resistant materials designed to withstand harsh weather conditions. The safety pin fits a wide variety of trailer couplers, as well as trailer jack wheels, pintle hooks and more.