There was a very similar deal posted yesterday for £5 less, but this one is different because it can not only be C-clamped to the edge of the table but also Grommet installed which is what I am looking for and works for me.
UNIVERSAL: Fits majority of 17'' - 27 inch flat panel screens and monitors weighting from min 4.4 lbs up to 14.3 lbs max, VESA compliant min 75x75mm to max 100x100mm
FULLY ADJUSTABLE: The durable gas spring system ensures easy one-touch positioning of your screen in any desirable setting; personalize your workstation any way you want
STABLE: C-clamp on any working surface or grommet installation; comes with all needed hardware. Heavy-duty construction and superb quality materials keep your arm mount stable - this is the sturdiest desk mount on the market.
FULL MOTION MOUNT: A wide range of movement: the screen can be rotated and tilted effortlessly in any direction - up 35 deg and down 50 deg with a combined 360 degrees landscape rotation.
ERGONOMICS: Improve your overall well-being by creating most comfortable viewing angle for work or gaming - enjoy the freedom to adjust your monitor height and angle: your spine, neck, and shoulders will be thankful.