The unique Flex Design of the DS-319STA makes this the best Triple Arm Mounting Solution for your LCD Monitors. DoubleSight"s Flex Design offers the user complete flexibility when adjusting their monitors on the desktop. Each Monitor adjusts independently of the other Monitor for Tilt, Swivel and Pivot for a truly custom view. The center Monitor adjusts for Tilt and Pivot only. In addition, users can also move monitors forward or backward on the stand for a better ergonomic fit. The Height adjustment is for the main pole only. All DoubleSight Multi Monitor Stands ship completely assembled and are compatible with LCD Monitors which are VESA 75x75 or 100x 100 compliant. No tools required - simply attached your monitors and enjoy the view. The DS-319STA can also be upgraded to accomodate additonal Monitors as your viewing needs change. Purchase a DS-22T Dual Monitor Extension or DS-23T Triple Monitor Extension to add additional rows to your stand. The DS-22T & DS-23T easily convert your Triple stand hold as many as 9 Monitors. Additional accessories include Desk Clamps and Grommet Mounts to secure your monitors in place. If you need additional height, a pole extension is also available.