For 17–30-inch monitors, the North Bayou H100 monitor stand Support for VESA: 75x75 and 100x100 mm are supported. Please confirm that all of the product's VESA plates measure 118 by 118 mm. Ergonomic Design: Personalize your workspace, integrated ultra-sensitive gas spring that enables 360° rotation in either horizontal or vertical mode and +85° to -30° screen tilt adjustment; Maintain your monitors with an unmatched range of motion with a 9.8" (250mm) steep lift and rotation from +90° to -90°. Simple Installation: C-clamp or grommet hole mounting: Grommet mounting fits hole diameters ranging from 0.39 to 1.97" (10-50mm), while C-clamp works best on table thicknesses up to 3.54" (90mm).