Curt Towing Starter Kit With 2" Ball, 4" Drop, 2" Shank. Rated to 7,500 lbs gross trailer weight and 750 lbs tongue weight. Fits trailer hitches with a 2" x 2" receiver tube opening. Factory-torqued trailer ball accepts 2" couplers. CNC-formed, robotically welded and mechanically descaled for a perfect fit. Key-operated hitch lock adds security to your trailer. Hitch tube cover protects receiver from grime and rust when not in use. Sturdy, reusable case keeps items well-protected. Reusable case is able to be shelved or hung on pegs. Includes ball mount #45050, trailer ball #40037, hitch lock #23515, hitch tube cover #22272, pin & clip and reusable case. Weight capacity may change if trailer ball is removed.