Cotytech Expandable Dual Desk Mount Spring Arm Grommet Base - Dark Gray (DM-GMD12-G) Supports up to 2 x 27" LCD monitors; 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) Pole length: 7.87" (200mm); Expandable to support three monitors with additional arms. Longer pole will be needed; Height Adjustment Range: 5.1" at 7.87" pole (16.95" at 19.7" pole), 11" - 12.6" 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: Dark Gray (please contact us for special order of white or red color) Weight Capacity: Supports 8.4 - 17.8lbs (3.8 - 8.1kgs) for each monitor; Tilt: +90 Degree / -45 Degree; Rotation: 360 Degree; Swivel: Max 180 Degree; Mounting Pattern: VESA compliant: 75x75 and 100x100; Maximum extension: 22" (559mm) 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