This heavy duty rated trailer ball will give you years of service. - This ball will handle anything your class 3 trailer hitch and class 3 ball will handle, up to 7,500 lbs. - This tow ball is perfect for towing all types of heavy receiver-style trailers from dump trailers to deluxe RV's and farm trailers. - Ball is heat treated for optimum wear resistance. - Curt thoroughly tests these 2.5" balls for safety to help give you peace of mind and keep your cargo safe. - Meets U.S. VESC and U.S. V-5 specifications. - Fits most class 2 to 3 hitch mounts (see shank size below). - Has fine threads for superior holding strength. - Zinc plated hex nut and helical lock washer included for secure mounting.