CURT 60681 Double Lock EZr Gooseneck Hitch with Flip and Store Ball, 30,000 lbs., 2 5 16 Inch Ball, Fits Select Chevy Silverado, GMC Sierra 2500, 2500 HD, 3500, 3500 HD hitches Allows for secure mounting of GH 1724 Allows for secure mounting of the spring bars on the trailer frame Multiple mounting holes for precise leveling of the load Rigid design helps maximize integrated sway control Bracket protected by a highly durable carbide powder coat finish Prevents trailer ball from being inserted into the coupler Universal design fits most couplers Die cast trailer lock with dual ratchet locking system Protected by a durable hammer tone epoxy finish Includes two keys for added convenience Limited lifetime warranty (one year finish They've made the truck said to turn the world under its tires and the trailer that moves mountains in a day It uses two locking pins and a 3 8" diameter handle to keep the gooseneck ball locked into the center section