Design: Fits most flat or curved LCD/LED screen from 13 to 49, and supports up to 33lbs with 75x75mm and 100x100mm mounting holes. The two-stage locking system is compatible with 0.39"-1.8" thick desk for both C-clamp and Grommet Base Fully Adjustable: The high-grade steel gas spring arm can be extended and retracted to your ergonomic position. Monitor head can tilt +45°/-45°, swivel +90°/-90°, and rotate +180°/-180°