Loctek LCD Arm Desk Monitor Mount Fits 10''-27'' Monitor (D7A) 1. Arm easily adjust to support an ergonomically correct workstation; sit more comfortably at your desk while reducing neck, eye and back strain, extend or retract monitor arm; rotate monitor to landscape or portrait mode 2. Gas spring hovering system gracefully adjusts monitor height 3. Aircraft-grade aluminum arm features a stylish anti-scratch surface 4. Cable management system organizes wires for a tidy desk. Option 1:Clamp: For desk thickness:0.78-4.72 inch(20-120mm) Option 2:Grommet: Size of the hole:1/3 inch-2.75 inch(8.5-70mm). Table thickness:0.78-4.72 inch(20-120mm) 5. Front-loading ports for audio, mic & USB 3.0.DO NOT FIT FOR Apple Thunderbolt Display 6. Available VESA 75X75/100X100 and fits most 10''-27'' monitors - check for standard VESA mounting hole dimensions on back of monitor 7. Durable hardware supports clamp or grommet installation 8. Supports monitors weighing 4.4-19.8 lbs.