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Description Next Level Security Having the best coupler locks is not an easy task. Model 2516 fits most trigger latch and thumb latch couplers. Rest assured Proven Industries trailer lock will leave you with simply the best coupler lock on the market. No other trailer coupler locks can secure your safety chains. Fine Print Trailer coupler lock model 2516 may fit other trailer couplers not listed. Please look at trailer coupler lock index for exact fitting couplers if you can not find your style trailer coupler pictured please email us a picture of your trailer coupler to insure you get the correct one. You can also use this to secure other items to your trailer. Lock Core Cobra 7 Standard The Cobra 7 is a patented key system that was developed for the high-security needs in the vending industries. The COBRA tubular keyway is like no other with its 7 sided tubular keyway this unique feature stops anyone from going to a hardware store to copy your key. This product offers a high-security solution for those that are looking for excellent exterior performance. Proven Disk-Detainer Upgrade Option The Proven Disk Detainer Lock was developed for high-security situations where minimum maintenance is not possible. This particular lock is virtually impossible to pick due to its rotating disk and requires special lock picks and skills needed in order to pick. Application Disk detainer locks are not all that common in everyday use. Mainly this style of lock is reserved for high-end locks. These lock perform well in extreme weather conditions with minimum if any maintenance. You will find this high-security lock in most prisons government facilities and even the White House! This particular lock is virtually impossible to pick due to its rotating pins that not only need to be at the right height but the right rotation in order to unlock. Application Medeco is typically needed for the high-security needs of companies that need key control or grandmaster key solutions. All parts are machined out of brass and hardened steel for the combination of great exterior performance and high-security needs. *Medeco and Abloy is available upon request for an additional fee.