Made for compatible gooseneck couplers for a precise, secure fit Made in USA: Family-run business made with heavy-duty industrial-grade welded steel to be bolt cutter and crowbar proof Helps deter unauthorized hookup and trailer theft during storage or parking High-Security Cobra SideWinder Puck Lock: Designed with advanced pick resistance, limited key blank access, and over 250 million possible key combinations. Uses a multi-plate locking system with anti-picking grooves and a sidebar mechanism to keep the cylinder engaged when locked. Symmetrical key design allows insertion in either direction for easier daily use. Application Use: Ideal for contractors, haulers, RV owners, and utility trailers during storage, parking, or transport This gooseneck trailer coupler lock is designed for compatible gooseneck couplers to help deter unauthorized hookup when the trailer is parked, stored, or transported. It is constructed from welded steel, designed to resist common prying and cutting tools, made in the USA. Common use cases include ft, knox, gen, y, adapt, king, pin.