Ultrawide Compatibility: Single steel and aluminum mount for ultra-wide monitors up to 49 in size and 39.6 lbs in weight with 75x75mm or 100x100mm VESA patterns. Heavy-duty C-clamp secures to desks up to 3.34 thick Vertical Height Adjustment: Raise your screen from 12.3 to 18.7 above the desk surface and find just the right viewing height with the convenient and space-efficient vertical lift system