Trailer Ball Vehicle Class III IV Ball Diameter 1 7/8 in 2 in Gross Towing Weight Capacity 3 500 lb 6 000 lb Gross Vehicle Weight Capacity 3 500 lb 6 000 lb Material Steel Finish Chrome Features J Groove Design Limited Lifetime Warranty (1 yr Finish 1 yr Parts) No Tools Coins or Pins Required for Trailer Ball Installation Shank Bears The Weight Freeing The Coupler From Friction and Binding Shank Diameter 1 in Shank Length 2 1/4 in Standards SAE J684