Compatibility: Fits most flat panel monitor up to 27” and supports weight up to 22lbs per arm. Mount plates detachable and height adjustable compatible with VESA mounting holes 75x75mm and 100x100mm. Multiple Options: Two-stage locking system C-Clamp and 4” diameter Grommet-Base both systems are compatible with 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 a 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 Quad Monitor Mount (Black) 1 x Mounting Hardware Kit 1 x User Manual 10 Year Protection.