NORTH BAYOU H100 MONITOR STAND FOR 17-30-inch MONITORS VESA Support: Supports 75x75mm and 100x100mm. Please check that the size of all VESA Plate of this product is 118*118mm. Ergonomic Design: Customize your working condition, Built-in with ultra-sensitive gas spring, allows +85° to -30° screen tilt adjustment, 360° rotation for horizontal or vertical mode; Steep lift 9.8" (250mm) and rotation from +90° to -90°, Hold your monitors with an unparalleled range of motion. Easy Installation: C-clamp or Grommet hole mounting, C-clamp works great on table thicknesses within 3.54" (90mm), while Grommet mounting fits hole diameters from 0.39 to 1.97" (10-50mm).