CURT 40084 Stainless Steel Trailer Hitch Ball, 7,500 lbs, 2-5/16-Inch Diameter, 1 x 2-1/8-Inch Shank. This trailer hitch ball is rated to tow up to 7,500 pounds gross trailer weight. It is constructed from corrosion-resistant stainless steel for reliable towing strength and confidence on the road ahead. This tow hitch ball has a 2-5/16-inch diameter to fit virtually any 2-5/16-inch coupler. The ball shank has a 1-inch diameter and measures 2-1/8 inches long for secure attachment to a trailer hitch ball mount. Exceptional resistance to rain, mud, road salt and other corrosive threats, this hitch ball is constructed from stainless steel, providing excellent strength while maintaining long-lasting rust prevention. Dependable strength, this trailer hitch ball comes with a zinc-plated hex nut and helical lock washer. It also has fine threads for an enhanced hold on the ball hitch (250 lb.-ft. torque required). Tow ball is tested to U.S. VESC