Fastway Fortress 86-00-5015 Maximum Security Universal Coupler Lock for 1 7/8 Inch, 2 Inch and 2 5/16 Inch Couplers Fits virtually all 1-7/8, 2, and 2-5/16 tongue type trailer couplers to prevent your trailer from being stolen. Two barrel-style keys included. This style of locks are harder to pick and much safer than others. Anti-drill lock design. Limited Lifetime Warranty Unique shackle shape designed to prevent the lock from being pried off your trailer.