3M Ma140Mb Mechanical Adjust Monitor Arm Desk MountedDescriptionSpecificationsShipping This adjustable monitor arm allows for several height options for placing your monitor in the best ergonomic position, while offering more desk space. This highly adjustable monitor arm moves up, down, forward and back Provides 7 1 2 Inch of pole height adjustability, 18 1 2 Inch height adjustability from the surface and extends 19 1 2 Inch from the base Clamp mount hardware fits desks up to 4 1 4 Inch thick and