PACLOCK's UCS-88A is engineered specifically for trailer coupler latches found on campers, flatbed trailers, utility trailers, landscape trailers, enclosed trailers, and cargo trailers. The UCS-88A was developed in response to your request to be able to key all the locks on your trailer together. There is no other coupler lock on the market that allows you to key the coupler lock into other locks on your trailer. The “U-Shaped” design of the UCS-88A prevents any type of bolt cutter attack. Machining the body versus casting the body is critical because casted bodies can be easily defeated by melting the bodies with an off-the-shelf plumber's torch. A body that was CNC machined from solid aluminum can hold up to the torch test. Don't buy die-cast padlocks ever! 6-Pin technology (more than the industry standard 4 pins) provides over 20,000 unique key codes and makes duplicate key combinations extremely rare. Your key number is virtually unique to you. Stainless steel spool and serrated security pins make the lock pick, bump, and drill resistant. PAC-BAND keeps dirt, grime, and other elements out of your cylinder, extending the lifespan of your lock, while the PAC-Tether ensures that you'll never lose your lock! CNC machined for precision and reliability, the lock body exceeds +/-0.003” tolerances for repeatable quality.