This set of lockers does not bolt together and needs to be wall mounted in position upon assembly.
Hardware is not included with this item and should be sourced locally, as the necessary installation components can vary based on the material of the surface that the product will be mounted to (drywall, brick, concrete, plaster, etc.).
The installer will need to drill their own holes in the back wall. There are multiple ways this can be done. Some installers will predrill holes and others will simply use screws that are designed to go directly through metal without needing predrilled holes. This will also depend on the type of wall it is mounting to. We recommend using a local contractor to install this to ensure it is done safely and properly.
We suggest purchasing hardware from your local hardware store that is designed for your specific wall type. We are unable to advise or offer applicable hardware.