Granite bartops that extend far enough to actually be functional, require the use of some sort of support structure.  Usually, that means installing brackets underneath, which, depending on their size, can either be a bit fugly or can be knee-bumping annoying and restrict the positions and quantity of your barstools.

This little beauty by Made of Metal, on the other hand, remains hidden beneath your granite slab:

Made of Metal's Hidden Bracket, $17.50-25.50.

Made of Metal's Hidden Bracket, $17.50-25.50.

How does it work?  This is what you start with:

hidden_granite_support_brackets_2

The long portion is installed inside your cabinet.

Pretty genius, no?