Compatibility: To ensure compatibility with the dual monitor mount, your each monitor must meet three conditions at the same time: First, computer screens size range: 13 to 32 inches. Second, screen weight range: 4.4 to 22 lbs. Third, the back of the monitor screen must have VESA mounting holes with a pitch of 75x75mm or 100x100mm. Easy Installation: With 2 separate mounting choices: "C" clamp and Grommet mount. "C" Clamp mount is the most common for home office use, fits over an edge thats free of obstructions on both the top and bottom of the desk, fits desktop thickness 0.39-3.15. Grommet mount fits desktop thickness 0.4-2.17, using the hole of the desk, offers supreme stability, and can keep your screen fixed firmly and safely in place. Additional Unique Design to Minimize Sagging: ErGear dual monitor stand is built in aerospace-grade aluminum and has a reinforced oval-shaped center column. This design increases the contact area with the arm joints by 30%,