Ultrawide Monitor + Laptop Desk Mount: Fits 1 ultra-wide screen up to 49 (above laptop tray) or 45 (side-by-side with laptop tray) with VESA 75x75mm or 100x100mm mounting holes. Holds up to 17' laptops Heavy-Duty Cast Aluminum Construction: Clamp base (fits desktops up to 1.8 thick) and arms are made of premium cast aluminum for maximum strength, scratch resistance, and durability. Supports ultrawides up to 44 lbs and laptops up to 13.2 lbs