Compatibility Fits most flat panel monitor up to 27 and supports weight up to 22lbs per arm Mount plates detachable and height adjustable adapt to VESA mounting holes 75x75mm and 100x100mm Multiple Options Two stage locking system C Clamp and 4 diameter Grommet Base both systems are adapt to 4 thick desk Multiple Adjustment The high grade arms extend and retract 90 tilt and swivel to change reading angles and 360 rotate from landscape to portrait mode Double Benefits Monitor arm is easily adjustable on the 31 5 height pole Double efficiency and productivity by opening up desk space allow working in a more comfortable ergonomically correct position to reduce neck and eye strain Package Includes 1 x WALI Extra Tall Dual Monitor Mount Black 1 x Mounting Hardware Kit 1 x User Manual experienced and friendly US based customer support available to assist 7 days a week