COMPATIBILITY - Fits two screens up to 27" in size and 14.3 lbs in weight each with VESA 75x75mm or 100x100mm mounting holes. Mounts to desks (up to 3.25’ thick) with heavy-duty C-clamp or optional grommet mount. PNEUMATIC SPRING ARMS - Tool-less monitor placement with perfect counterbalance presentation in all directions. Please Note: The back of the arms will extend past the edge of your desk. FULLY ADJUSTABLE - Mounting brackets offer +90° to -45° tilt, 180° swivel, and 360° rotation. Monitors can be placed in portrait or landscape orientation.