Horizontal Dual Adapter Arm: Converts a single monitor mount into a dual monitor mount using the middle VESA plate, which has mounting bolt holes in both a 75mm and 100mm pattern. Comes with cable management clips to keep your cords organized. See video for installation and functionality tips. | Dual Monitor Wall Mount: It can also be used as a wall mount for 2 computer screens 13 15 17 19 21.5 24 27 inches in size that use the VESA 75mm or 100mm bolt hole patterns located on the back of the monitor (measure the distance between bolt holes with a ruler, in millimeters, if unsure of size). Does not include wall anchors. | Functionality: When on a desk stand, monitors will tilt 45 degrees up and 45 degrees down, swivel 15 degrees left and right, and both monitors can rotate and be held in either landscape or portrait orientation. Please note: Against a wall, tilt and swivel function will be more limited. | Heavy Duty: Each VESA head can hold displays up to 11 pounds each, and original single mount must be able to withstand the added weight as well. Steel construction and scratch-resistant black powder coating will stand the test of time. | 5-Year Warranty: Comes with a 5-year warranty and our friendly, US-based customer service team would be happy to answer any questions you may have during normal business hours.