SM-VM1 is a vesa mount bracket designed for speakers using a vesa mount mounting pattern, similar to Barefoot Footstep series
The SM-VM1 is a SM-SW1/SM-UM1 adapter plate that connects to speakers with purpose built Vesa Mount holes as a way to mount the speakers.
The SM-VM1 has two swivel connection hole patterns. 40x40mm for the SW-1 swivel and 20x20mm for the SM-UM1swivel.