PACLOCK’s “UCS-77S-2178” trailer coupler lock is the best choice for securing Standard 2” couplers. Our patent-pending two-piece system improves on an expired patent by integrating the stainless-steel cone puck, creating a more secure, user-friendly, and affordable solution. Why is PACLOCK doing this? We know our competitors have been overcharging for years, and now we’ve designed and manufactured a superior product that our family business is comfortable selling at an affordable price. No gimmicks, no games – just great products at the right price. Every “77-Series” lock comes with 304 grade stainless steel patented cone-shaped puck, while the competition charges $100 extra for an “upgrade” to a lesser quality 303 grade stainless-steel. In addition, our competition can’t provide the cone-shaped puck. The patent-pending two-piece design of the “77-Series” ensures seamless installation with consistent alignment, unlike products with a loose puck. Its patented cone shape resists frontal drilling attacks, making it a customer favorite for years. While 304 stainless is more expensive and difficult to machine, it offers superior corrosion resistance compared to the 303 or 302 used by competitors. The 1/4" steel shield is double protected with zinc plating and powder coating for maximum resistance against the elements, corrosion, and tampering. The “77-Series” also secures chains to further prevent trailer theft. PACLOCK’s “77-Series” is the best product out there. With PACLOCK’s Universal Cylinder System (UCS), use the same key for all PACLOCKs on your trailer and RV. Thanks to “Every Lock, One Key” (ELOK), secure your coupler, trailer door, latch pin, hitch receiver, YETI cooler, gates, and more – all with ONE KEY! While most companies are cutting product lines, PACLOCK continues to innovate, providing efficient, uncompromising security solutions.