The diameter in the shank for the hitch pin would be 5/8". The hole where the ball goes is 1" diameter.
Curt Manufacturing, Loaded Ball Mount w/ 2in. Ball (2in. Shank, 2in. Drop), Ball Diameter 2 in, Model# 45036

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- Rated to 7,500 lbs. gross trailer weight and 750 lbs. tongue weight
- Fits trailer hitches with a 2" x 2" receiver tube opening
- Factory-torqued CURT trailer ball accepts a 2" coupler
- 2" drop for precise trailer leveling
- Hollow shank weighs less and can be used with an anti-rattle kit
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