Because of it's hight, you should be able to use any size potato, the arm goes all the way to the top. I've been busy and haven't gotten to use it yet. They say not to use it on sweet potato's because they are harder than regular potato's. The blades are thin and can break easy, so that's why they say not to use sweet potato's. I hope this will help you.
By Byron Boyle
Hi,buyer,
Thank you for your email.
The tallest cutting height of this commercial vegetable fruit chopper is about 7.85 inch. So you can put fruits and vegetables up to 7.85 inches in diameter.
Hope it helps.
Customer support center
Jennifer
By Hubery Tony