Adapter for mounting speakers with the 100X100mm square mounting hole pattern to the rectangular hole pattern of the MultiMount. The adapter first receives the 5/16” screws in the rectangular hole pattern then is attached to the loudspeaker using the included metric screws. That means that the 5/16” screws are protruding out and the last step is to secure the MultiMount over the protruding 5/16” screws using the included flat washers and locking nuts.