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 This L shape bracket is widely used for any shelf install, such as bookshelf, garden shelf, table,exhibition, chair, external wall brackets 90 degree right angles integrated molding, the thickness of the bearing capacity is strong This is an important fastener to join two furniture parts together Make from Stainless Steel, sturdy and enduring, and not easy to rust, Manufacturer: Zkydhbd