JOY worker Clamp-on Adjustable Armrest, 360 Rotating Desk Elbow Support

No Drilling & Damage-Free: The desk armrest uses a universal C-clamp for easy, tool-free installation that won't mark your desk. Not suitable for desks that have a protruding edge or a significant slope. Please check your desk before purchase | Fits Thicker Desks: This universal adjustable arm rest features an expanded clamping range to securely grip thicker tabletops. The elbow rest suitable for flat desk thickness from 0 to 3.7'', surpassing the common 2.0'' max | 6 Level Height Adjustment: The 360 rotating armrest featured with six preset height position, range up to 2.8 high. The lowest height of this arm support can be 1.2" below the desktop, and the max height can be 2.8" above the desktop | Above/Below desk platform optionalOur computer arm support offering two installation methods to meet your different needs. The first option adapts to desks with thicknesses ranging from 0-3.1", while the second fits desks from 0.7-3.7" thick | No installation required: It's ready to use right out of the box. The desktop arm rest can be unpacked and installed on your desk in seconds. It supports up to 11 lbs and relieves 90% of the weight undertaken by your elbows