Description Having the best coupler locks is not an easy task. We pride ourselves on a glove-like fit security product and with that being said this will reduce the percentage of thieves that are capable of breaching our security products.  Our American-made lock is designed to resist most power tools and grinders. Stopping would be thieves in their tracks!  Don't be fooled by third party products often made in China.Rest assured Proven Industries trailer lock will leave you with simply the best coupler lock on the market.   Fine Print   Trailer coupler lock model GP-2516 may fit other trailer couplers not listed. Please look at our 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 ensure you get the correct one. Please send all pictures to Support@provenlocks.com Please contact Support@provenlocks.com with any questions *Please note, product pictures may not represent the current model, as products are revised.  All locks are now upgraded to 7 pin tubular lock at no additional cost. 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. COBRA 7 comes standard in all of our products at no additional cost. Application The Cobra 7 system is geared for the business owner looking for a great performing lock system at an affordable price with key control. 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 loc