3/16 welded steel construction with a no-nonsense design which fully encompasses the King Pin head of a 5th wheel coupler.  Accepts most “puck” style locks (sold separately) which by design are completely bolt cutter proof.  Fits all King Pins and our unique design helps keep the grease inside the lock and not on your hands or transferring to other items.  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.  We offer discounts starting at 10 or more Ft. Knox Locks. Bright yellow powder coat.  Made in America!