SIIG Full-Motion Adjustable Gas Spring 24lbs-Capacity Ergonomic iMac Desk Mount Two-piece mounting plate is designed to hold the latest 21" and 27" iMac systems with a weight capacity up to 24 lbs The premium-quality gas spring-assisted mounting arm provides smooth and effortless viewing angle adjustments and a height adjustment up to 11 inches tall Supports 360-degree arm swivel, mounting plate allows tilt angles of 35 downward/90 upward, and 180 pan angles (left/right) Heavy-duty C-clamp is compatible with desk surfaces from 0.4" to 3.3" in thickness and the grommet mount fits through surface holes from 3/8" to 2.25" wide and up to 3" thick. Both quickly install onto most desks or tables Integrated cable management system keeps cables neat, organized, and out of the way