Curt Manufacturing 45426 Towing Wiring Fits trailer hitches with a 2 1/2" x 2 1/2" receiver tube opening Equipped with a 1 1/4" hole to accept a trailer ball shank 3 1/2" rise or 5" drop for precise trailer leveling Shank constructed from solid steel for optimum strength CNC-formed, robotically welded and mechanically descaled for a perfect fit