Ergotron 60-350-200 Grommet Mount Base for DS100, worksurface hole 3/8" to 3" (10 to 76 mm) wide and up to 3-1/4" (82 mm) thick, Includes extra cable-management ties and straps, Black. Ergotron 60-350-200 adapts any DS100 for attachment through grommet hole in a worksurface.