With this unique accessory your gas lift arm holds two displays at the same time. This duo holder consists of two joint (very flexible) based VESA centerpieces that suits M VESA Gas Lift Arm Single and Single HD Series. With M VESA 75 100 Duo Crossbar you can have two screens attached to one gas lift arm, both with the unique quick release mounts so screens are ready to be exchanged if ever needed. The M VESA 75 100 Duo Crossbar is as its the name points out fully VESA compatible, so it can be mounted on most screens with VESA standard.