It can hold up to 3 monitors stably

the base of the monitor stand riser is different from the C-clamp or Grommet base

The arm can extend up to 20

With just a finger touch

<Universal Monitor Stand with Stability & Flexibility>Weighted base of the desktop monitor mount provides enhanced stability

Single Monitor Desk Mount for 13''-35'' Monitors MU6005 42''-70'' Mount It can hold up to<Universal Monitor Stand>MOUNTUP monitor desk mount perfectly fits most flat or curved computer displays up to 35 inches, holds 6. 6 26. 5 lbs, suitable for VESA patterns of 75x75mm & 100x100mm. Compatible with ASUS, Acer, Samsung, LG, HP, AOC, Dell, Lenovo, Gigabyte, etc., including but not limited to 17 35 inch screens. <Gas Spring Height Adjustment>The built in advanced gas spring system provides 9. 4 inches of smooth height adjustment. And the