Cotytech Expandable Apple Desk Mount Spring Arm Grommet Base - Silver 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. Desk-mountable, available in clamp base and grommet base; Clamp table thickness: 0.2"-2.21" (5-55mm); Grommet table thickness: 0.2"-2.21" (5-55mm), Hole Diameter: 0.39"-1.97" (10-50mm); Weight Capacity: Supports 17.6 - 30.8lbs (8 - 14kgs); Tilt: +90 Degree / -45 Degree; Rotation: 360 Degree; Swivel: Max 180 Degree; Mounting Pattern: VESA compliant: 75x75 and 100x100; Maximum extension: 27.6" (700mm) Pole length: 7.87" (200mm); Expandable to support two monitors with additional arms Longer pole may be needed depends on monitor size; 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