CURT 23088 Trailer Lock Set for 2 Inch Receiver and 2 Inch or 2 1 2 Inch Coupler hitch a 5th wheel wedge inserts harness a 5th wheel wedge inserts into the hitch head Mounts to an MV round bar WD hitch head to help level the trailer and tow vehicle Fits CURT MV round bar weight distribution hitch #17051 Pre assembled with spring bar chain for ready attachment Multiple chain links allow for flexible adjustment of tension Constructed from forged steel for optimum strength Protected by a durable powder coat finish keep your toys more secure with CURT locks the hitch lock is designed to insert into the hole in the side of a receiver tube to hold a ball mount or hitch mounted accessory in place