Curt Manufacturing 45425 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 1 1/2" rise or 3" drop for precise trailer leveling Shank constructed from solid steel for optimum strength CNC-formed, robotically welded and mechanically descaled for a perfect fit