The C.ME Dual Monitor Arm is a favourite. It is a quality finish product and very easy to adjust. The new mount means it can hold a large range of different size screens.
Specifications
Bolt Through and Desk Clamp (both included)
Integrated Cable Management
Quick Release Mechanism to replace the monitor
90 Degree portrait to landscape screen rotation
Weight Capacity 8kgs per screen
7-year warranty is included for a guarantee against faulty workmanship or materials with normal office use.