If drilled directly into the studs of a wall, a shelf bracket can hold an average of 75 pounds of weight.
Shelf brackets can be made out of various materials, including sturdy wood and high-quality metal.
As shelf brackets should be mounted into studs for maximum efficiency, they should be placed as far apart from each other as the studs in the wall are.
For maximum efficiency, each shelf should be held in place by the same number of brackets as there are studs in the wall over the length of the shelf.
Shelves designed to fit into the corner between two walls do not require shelf brackets in order to mount.