Reese, 3-1/4", class iii, ball mount kit, 5,000 lb, gross weight capacity, 500 lb tongue capacity, fits 1" diameter ball, 3-1/4" drop, 2" rise, 9-1/2" length, black finish, for use with 2" square receiver opening, including an interlock ball mount with pre-torqued interlock hitch ball, 1 wrench tightening system.