Proven Lock 400 GL-IL

The Proven Lock 400 GL-IL is a jam-bolt style lock designed to secure trailer couplers and related hardware. It installs through existing holes or latching points on coupler assemblies to prevent unwanted uncoupling or theft attempts, providing a physical barrier against tampering. Proven Industries builds its locks from rugged materials and uses pick-resistant cylinders for added security, making this model suitable for utility, equipment, and cargo trailers where dependable hitch area protection is needed. Proven Industries products are engineered and manufactured in the USA for trailer security applications.