COMPATIBILITY - Dual monitor mount fitting two screens 13" to 27" in size and 22 lbs in weight each with 75x75mm or 100x100mm backside mounting holes FULL ARTICULATION - Adjustable arm offers +80 to -90 degree tilt, 180 degree swivel, 360 degree rotation, and height adjustment along the center pole. Monitor can be placed in portrait or landscape shapes DESK CLAMP - Mounts to the back of your desk (up to 4" thick) via a heavy-duty C-clamp or optional grommet mount