3/16 welded steel construction with a no-nonsense design which fully encompasses the gooseneck coupler latch.  Accepts most “puck” style locks (sold separately) which by design are completely bolt cutter proof.  Fits the most common versions of gooseneck couplers including the Bulldog BX1 as well as square tube versions.  Time, noise, power tools or a cutting torch will be required to defeat our lock design which will eliminate most theft interest. We also sell a few different brands of the “puck” style locks (sold separately) with varying levels of security. DO call us for clarification if you have any questions. Be sure to check out the installation video HERE. We offer discounts starting at 10 or more Ft. Knox Locks. This version also fits many of the offset and Shocker models of gooseneck couplers.  DO call us for clarification if you have any questions.  NOTE:  If you own the Bulldog cable lever (also sold under other names) DO NOT BUY this model – we have a model specifically designed for that application – see “Bulldog cable lever gooseneck lock”.  Consider out Gooseneck latch & set bolt combination deal with keyed alike locks & free shipping!  Made in America!