Loctek D7D Dual Monitor Mount LCD Arm 10''-27'' Computer Screen Heavy Duty Swivel Desk Mounts Height Adjustable Gas spring 1. ARM easily adjust to support an ergonomically correct workstation; sit more comfortably at your desk while reducing neck, eye and back strain. 2. Fits monitors with VESA patterns of 100 x 100 mm And and 75 x 75 mm. Bearing weight : 2-9 kilograms (4.4-19.8 pounds) per arm. 3. Dual Display mount to keep your desk and workstation clear, Durable polished aluminum construction! 4. Durable hardware supports clamp or grommet Installation, option 1: clamp: for desk thickness:0.79-4.72 inch(20-120mm) option 2: grommet: table thickness:0.79-3.94 inch(20-100mm) 5. Gas spring hovering system gracefully adjusts monitor height, swivel action for greater positioning flexibility.