1 7/8" Hitch Balls
Reese recommends that you torque all 3/4" shank balls to 160 ft. lbs., and all 1" to 250 ft. lbs.
Always remember to grease your hitch ball when towing.
Class I and II Hitches (1 1/4" x 1 1/4") use a 3/4" Shank
Class III hitches (2" x 2") under 6,000 lbs use a 1" Shank.