Lock your ball mount into your trailer hitch with the CURT .5 in Hitch Lock with .625 in Adapter. This CURT hitch lock comes with a .5 inch diameter pin with a .625 inch diameter adapter sleeve to allow it to be used on either a 1.25 inch or 2 inch receiver tube. It also features a right-angle design with swivel head for easier access. CURT .5 in Hitch Lock with .625 in Adapter - Trailer Parts And Accessories at Academy Sports