Trimax is proud to introduce its revolutionary interchangeable Multi-ball System allowing the use of all Three Ball Sizes on One Ball Mount! The balls are each pinned on to the center shank for ultimate strength. This system allows the use of a dropped or raised ball mount (depending on the height of rear of vehicle) of your choice (not included). System fits: 1-7/8", 2" and 2-5/16" Trailer Couplers. Weight ratings for each ball are 1-7/8" = 3,500 LBS, 2" = 6,000 LBS and 2-5/16" = 8,000 LBS. Treaded shank is 3.5" long and 1" wide. It is manufactured from chromed high strength steel. Includes hex-nut and lock washer.