🔐 Lock It Down: Your Trailer's Best Defense Against Thieves! Designed specifically for 2-inch trailer couplers and S-hook safety chains. Keep your trailer safe from theft with our heavy-duty lock. Constructed from hardened steel to withstand power tools and brute force. Special key design prevents lock picking and key duplication. Proudly manufactured in the USA for quality you can trust. Unique Key Design Hardened Steel Security Made in the USA The Proven Industries Model 2178 Trailer Lock is a heavy-duty security solution designed to fit 2-inch trailer couplers. Made in the USA, it features hardened steel construction, a unique key design to prevent picking and duplication, and a custom fit for S-hook safety chains, ensuring your trailer remains secure against theft.