Just curious, why such a big overhang?

I doubt the structure that the over hang attaches to can support it without falling over. What about using a couple of table legs?

I got my 20"x20" brackets from a company called Short Run Pro. (I am not affiliated with them in any way.) They come in any size you want and can also be custom ordered. The particular brackets I got are called Freedom Brackets. They are 3" wide and 1/2" thick cold rolled steel. They are meant to be hidden supports. They are attached to wall studs or a pony wall. Perhaps something like this will work for your application.

Here is a link that might be useful: Freedom Bracket

I got my desk brackets from here (1000 lb limit) but you would need something strong to attach them to, and I echo the poster about about worring about it tipping over. You could put some wood corbels over them to make them look better.

Here is a link that might be useful: support brackets

You would need those brackets to be at least 24" deep, and at that length, you might as well use stretcher bars and table legs. It would need to be massively strong, as well as the very very solid wall to which it should attach. No 3/4" cabinet back will be able to handle that.

That's twice as deep as you actually need for seating, so I'd really be interested in the design that is spec'ing that much overhang.

The island actually has a 32" overhang so 4 stools fit beneath it. That is how it is now, but with a laminate counter. See pic
[IMG]http://i32.tinypic.com/2i12gli.jpg[/IMG]

I can't get to the picture, but still don't understand the need for such a big overhang. I'd do table legs & horizontal support between them. How wide is the overall top? I hope you aren't planning on attaching this to a cabinet. Ask your fabricator what he suggests.

Here is a link that might be useful: granite countertops

I spoke to a tech support person at www.specialtytools.com regarding the CounterBalance for my 16" overhang. He seemed very knowledgeable, maybe he can help.

http://storage.specialtytools.com/pdf/Counterbalance_1.pdf

BTW I got Tresar's photo to open by typing in http://i32.tinypic.com/2i12gli.jpg.

The problem here is not supporting the granite....there are all sorts of things that can support the granite. But a granite overhang that large is going to be VERY heavy and there is no way that a cabinet can support it. The granite will act as a lever of sorts, trying it's best to tip over whatever it is attached to. Laminate is light...granite weighs about 20 pounds per square foot. If this over hang is 30" wide (we don't know how long) it weighs 50 pounds per linear foot. The forces on the cabinet to which it will be attached will be tremendous! Is there a reason you can't put a leg on each corner and a skirt between the legs? I have seen that done on many islands and it looks wonderful