Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What is the diameter of the base? I need to ensure it fits on my wine rack.
Document: Love the shape of these. Looks like the kind of glass you'd get at a nice restaurant. They are not as thin as reidel glasses but not thick and heavy either. Pretty sturdy. I'd gladly serve wine to my guests in these. I'm happy I found them. Good stem, base solid. But again NOT heavy. The shape of the glass is so pretty.
We decided at the holidays that our days of using impossibly  tall, huge wine glasses needed to be over...but we wanted a generous glass, none the less. This fits the bill perfectly. The shape is very pretty and concentrated the aroma nicely. The are heavy enough that they don't tip easily and we have had no issue with breakage nor uneven foot bottoms. They have gone through the dishwasher three times with no problem and seem to be as sturdy as any stemmed glass can be. Very happy!
The glasses are not as distinctiveas I hoped they would be, but they are still keepers. My wine drinking friends are not snobs.
One box came broken so I was disappointed with the packing. The glasses themselves are just right for white wine. Good weight and height.
I have gotten a number of compliments on both the red and the white wine sets and would heartily recommend both of these to interested potential customers.
Here's a toast to these wine glasses. I love the shape of the glass. It's great having an entertainment piece in your home similar to what restaurants have when they're serving wine.
These are very nice looking wine glasses. The stems are long so I have to angle them a little in the dishwasher. But they are dishwasher safe and wash up very nicely. They seem to be of good quality and were not very expensive.
The opening is rather small. I found them unpractical for a man's mouth.I'm rather used to straight wine glasses don't fancy coned ones.The quality of glass is ok.
I was looking for some everyday wine glasses and these are both sturdy and slightly different with their more angular shape. All in all, they good-looking and appear to be sufficiently resistant to breakage. A good value for the money
They are a lot sturdier than many wine glasses. Also, their shape is quite nice. One of my friends commented on how much she liked them so I sent her some for her birthday. I am going to buy another set of four.
Answer: The base is a schoch (as in tad) over 3 inches.  The glasses are well-shaped and help to make part of a beautiful presentation.