Cotytech Triple Apple Desk Mount Spring Arm Grommet Base - Silver (DM-GSTA-G20) Designed for the following Apple Monitors: 24-inch iMac (aluminum and glass); 27-inch iMac pre 2013; 24-inch LED Cinema Display; 27-inch LED Cinema Display; 27-inch Thunderbolt Display; If your Apple monitor is not listed above, please contact us for solutions. Pole length: 7.87" (200mm); Longer pole option available; Height Adjustment Range: 5.1" at 7.87" pole (16.95" at 19.7" pole), 11.2" - 13.4" at monitor; Maximum productivity and supreme ergonomic comfort Solid Aluminum die-cast construction; Space saving with its compact design; Neat and efficient cable management; Clean look with minimal hardware visible from underside of work surface; Easy installation and dis-installation; Color: Metallic Silver (please contact us for special order of white or red color) Spring arm design makes extension, retraction and height adjustments dynamically and easily; Maximum adjustment rendered by tilting, swiveling, rotation and dynamic height adjustment; Swift and easy movements and adjustments