Ensure that your trailer stays safe with this Gooseneck Coupler Lock. This trailer lock is designed to prevent unauthorized hook-ups to your trailer’s coupler. The lock is built for easy installation and maximum security using the pinhole on the gooseneck coupler. The body is made of heavy duty aircraft aluminum to prevent tampering, rust, and corrosion. Ideal for trailers stored outside or trailers unattended for long periods of time.