Use a drill to dig a hole on the wall or board and then install the screw holders. Use a screwdriver to tighten the screw on the brackets Make from Stainless Steel, sturdy and enduring, and not easy to rust This L shape bracket is widely used for any shelf install, such as bookshelf, garden shelf, table,exhibition, chair, external wall brackets This is an important fastener to join two furniture parts together 90 degree right angles integrated molding, the thickness of the bearing capacity is strong, Manufacturer: PENCHEAK