Over Chair Laptop Tray - Steel arm support attaches to the bottom tube section (1.7 to 2 in diameter) of a standard height adjustable office chair for ergonomic viewing and typing angles. Fits laptops up to 17 (depth should not exceed 11.5). Adjustable Tilt & Rotation - Enjoy a comfortable setup with a tilting surface and full 360° rotation for flexible positioning. Accommodates both left and right-handed users.