Towing Starter Kit - 2 Ball Towing Starter Kit, w/InterlockA(R) (Hex) Feature Ball Mount 2 Sq. x 8-1/2L x 2D x 3/4R, 6000 lbs. & 2 Hitch Ball w/Lock, Plastic Storage CaseFeatures: Includes 2 hitch ballIncludes receiver lockBlack powder coat finish over A-CoatFits 2 square receiver tube openingWARNING: This product can expose you to chemicals including Chromium (hexavalent compounds) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.