What is the diameter of the pole?

1.5 inch dia. For 9ft patio umbrella

What is the height of 9’ umbrella?

95 inch height after assembled the umbrella with bottom pole

Is there a grommet at top opening of umbrella canopy or is there just a hole cut in the fabric?

Yes, there is a grommet on the top of umbrella canopy, the dia. Is 1.65 inch.

What weight/size base would I need for this umbrella?

We suggest 50 lb at least.

What is auto tilt? Does that mean you cannot have it straight up?

It is crank to tilt instead of press button tilt.

What is the diameter of the hole at top of the umbrella?

1.65 inch dia. for the grommet

How many pounds does it weigh of a 6.5’ beach umbrella?

Around 4 lbs