The product has 2 kinds of installation methods. The first one is the hole-free version: you need to prepare strong glue(not included), apply the glue to the iron plate, and then install the desktop after the glue is fixed. The second is the expansion screws on the wall version: you need to remove the silver iron plate from the bracket, and then according to the bracket above the holes in the wall to confirm the position of the expansion screws into the fixed.