Viking Vault Trailer Hitch Security-  Coupler and Mount Bolt Combo. Orange Made in the USA 3/16" All welded steel. Bolt Cutter Proof. (2) Master Lock- Puck with 4 keys Orange Powder Coat Finish Will fit 2 5/16" Big Tex/ Demco EZ Coupler. The only way to open this system is with the key. Only power tools or a cutting torch have any chance against this lock. Coupler/Hitch not included