The CW locking system has been awarded a official US Patent # 9,033,358 in 2013 along with a newly filed patent pending claim in 2018, and to non provisional status on said claim or another official US patent filing in 2019! We are fully committed to being the best on the market and continue to develop and invest in new ideas! CW locking system is designed around the standard 2 3/4 disc locks which are one of the most secure and widely available locks in a wide range of prices. Great for individuals, fleets, commercial rental, and industrial for lock out tag out. It is also a built in design concept that everyone loses their keys occasionally and when faced with a cutting torch even the strongest lock will fail. My Patented concept allows the disc locks to be sacrificed without compromising the larger investment, while still protecting the lock shackle from bolt cutters and grinders. Warning: Do make extra keys, if you lose them it will require a cutting torch and some patience to remove the disc locks without damaging your CW Trailer Coupler Lock. TM