You will note that each corbel has two hanging strips on the back that is mounted in a routed area, so that the metal strip is recessed. This allows for flush to the wall installation. It is designed so that they will hang on the head of a #10 wood screw that is anchored into a wood beam in the wall. A moly plug anchored into a sheet rock wall will be sufficient. Be certain not to overload the shelf so that the stress on the anchors will not cause the moly plug to fail.