The most secure and universal trailer coupler lock available, fits virtually all 1-7/8â€, 2â€, and 2-5/16†tongue-type trailer couplers. Constructed with the highest-quality corrosion resistant materials, the design utilizes a hardened steel reversible “U†shaped locking bar that allows the lock to always be accessed from the front. Security is maximized by the solid engagement (not springs) of the dual locking pins into the U shaped shackle. Includes (4) barrel style keys and for additional security, the lock design also includes an anti-drill lock. With Fastway, your trailer will be protected from theft for years to come.