Curtain rod
Shelf bracket infos
You will find here the information about:

How to calculate the dimensions

The dimension of the model with a BALL END

How they are joint together in the middle
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Refer HERE for more info about the finish.
How to calculate the dimensions
Classic Bracket
You can leave 1 to 3 inches between the end of the bracket and the shelf edge depending on the dimension of the shelf. The brackets are not exactly the dimension showed, due to the forging process, even if we try to make it closer. It's more or less 1/8" to 1/4".
Industrial bracket
The dimension of the bracket is referred to the length of the shelf. For example, a bracket of 6" is made to receive a shelf of 6". So, It's calculated 6" from the wall to the end of the shelf and I leave a little space of around 1/8" between the shelf and inside the lip of the bracket.
The longest dimension is the length and the shorter is the height.