Towing Coupler, Product Type Towing Coupler, For Use With Trailer and Tow Vehicle, Gross Vehicle Weight Capacity 5,000 lb, Overall Length 4 3/4 in, Finish Zinc Plated, Features Features Holes to Accept A Safety Pin or Coupler Lock, Spring and Nut Posi-Lock Mechanism, Fits Ball Diameter 2 in, Vehicle Class Not Applicable.