One of our customers bought these on Amazon.com (above)

If You Have Trouble Finding An Umbrella Base That Fits, Consider This One
US Weight Umbrella Base
Dimensions: 16L x 16W x 6H in.
(we don't sell Umbrella bases)

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Umbrella Pole Diameter
All of our tables (30" tall and 36" tall) come with a 1-3/4" umbrella hole. 
​The most common umbrella pole diameter is 1-1/2" 
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84" table has 3 legs

middle leg has a poly umbrella pole receptor

​84" table umbrella installation tips​
The ​84" table has 3 legs including 1 in the middle. You will not be able to use a regular umbrella base with this table.  You will notice a poly receptor for the bottom of the umbrella pole attached to the middle leg. Drill a 1/4" hole straight through the top umbrella receptor piece as shown in the picture. Next, insert your umbrella pole and drill a hole straight through it. Buy a 1/4" x 4" stainless steel bolt and nut at Home Depot to bolt your umbrella pole to the table base.
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 17 years ago we started selling single color poly outdoor patio furniture. When we tried putting black trim on our furniture it sold a lot faster.

The picture above shows how 2 chairs might fit into a SUV.