Thickness: +2" Depth: +8" Length: 20", 24", 30", 36", or 42" The price is for 2 shelves, 4 "L" brackets, towel bar and mounting screws. The shelf will always be strongest when the brackets are attached directly to wall studs. Certain wall anchors may be used, depending on your wall surface. If you have any questions about your particular weight load or the installation, please contact your contractor. These shelves are repurposed, over-sized barn beams milled at an old traditional sawmill…