Package includes: 1 x WALI Gas Spring Single Monitor Desk Mount (Black), Mounting Hardware Kit, User Manual, experienced and friendly US based customer support available to assist 7 days a week. Double Benefits: Double efficiency and productivity by opening up desk space allowing a new range of adaptable positions for your displays, ergonomically correct position to reduce neck and eye strain. Sturdy Construction: The high-grade material gas spring arm can be extended and retracted, +45°/-45° tilt and +90°/-90° swivel to change reading angles, and 180° rotate from landscape to portrait mode. Adjust: easily with quick detach Mounting plate and hide messy wires with built-in cable management. Compatibility: Fits Monitors up to 35" and 33 lbs. The two-stage locking system is compatibility for 0.39"~1.77" thick desk for both C-clamp and Grommet Base.