The base is completely welded which increases the stability and the safety factor (no screws loosening) extremely. Also one has a very small assembly expenditure. For use in washing machines we are the only manufacturer to offer brackets for wall mounting. The use of a wall mounting increases the safety aspect and reduces the vibrations by integrated rubber elements. All bases have 20mm adjustable feet which are screwed into the washing machine base. The indicated load capacities refer to the dynamic load. In the version with shelf, this has a locking function when extended. We recommend that the shelf snaps into place when the machine is running. Under the following link you can see a video of the assembly in which you can also see the holders for wall mounting. Video assembly instruction