YTMARINA safety pin goes beyond the simple function of keeping a coupler latch safe. They are made of high-quality materials and have a universal design that can be used for many purposes in your towing gear. The safety pin is made of solid steel and provides enough strength to keep the trailer coupler locked. The zinc coating we use to finish our safety pins provides excellent rust and corrosion protection. This is necessary for any trailer as it is often exposed to these elements. The user-friendly design of our safety pin makes it easy to operate, and the spring section is extended for easier operation, allowing it to be operated with one hand. While maintaining effective safety. This safety pin has a pin diameter of 8MM and includes an 290MM Plastic Coating Tether and quick release ring that fits over the trailer coupler and prevents loss of the safety pin. Use safety pins to secure trailer couplers, jacks, casters, etc. Nuts and bolts just don't cut it when you attach the trailer to your vehicle. Secure your towing equipment with our safety pins.