UNIVERSAL: Fits Most 17'' - 30'' Monitor with the load from 4.4 lbs up to 19.8 lbs, VESA compliant 75×75mm 100×100mm,while, The whole VESA Plate is 118*118mm, Extra Longer Screw & Screw spacer may be needed if your VESA hole is inside a recession area. Pls noted that VESA plate part support 360-degree rotation(Rotate it to right position as needed) FULLY ADJUSTABLE: The durable gas spring system ensure easy positioning of your monitor in any desirable position; Personalize your workstation any way you want; Support C-clamp or Grommet installation, Heavy-duty construction and super quality materials keep your arm mount stable-This is the sturdiest desk mount on the market.