AMPLOCK U-HLP58318 hitch lock (for receiver tube 2 1/2'' X 2 1/2 or 3'' X 3'') Made to fit the size of your hitch when hitched and unhitched Materials used by AMPLOCK provide good rust resistance for use in all climates Easy to use with AMPLOCKs push and lock system The strongest lock to secure your vehicle hitch with high quality materials and control and identification key system Protect your vehicle hitch without worries with the best hitch lock on market **Make sure you choose the right model for your recever (tube 2 1/2'' X 2 1/2'' or 3'' X 3'') referring to pictures provided (photos are for visual reference only) or to our website www.amplock.com **