Compatibility: Fit most LCD, LED flat screen TVs and monitors up to 27 inches, and support weight up to 22 lbs per arm. For mounting holes 75x75mm or 100x100mm. The plates are detachable and height adjustable. Multiple Adjustment: The high-grade arms extend and retract, +/-90° tilt and +/-90° swivel to change reading angles, and 360° rotate from landscape to portrait mode. The free standing base can be replaced with grommet base for 3'' thickness desk.