Fits 138243 To 278243 Screens 8211 Extra tall dual monitor mount fitting two screens 13 to 27 in size and 22 lbs in weight each with 75x75mm or 100x100mm backside mounting holes. Mounts to desks up to 48243 thick with heavy duty C-clamp or optional grommet mount. Extra Tall Pole 8211 The 39 center pole allows you to adjust the monitors between sitting and standing positions. Integrated cable management is included to keep AV and power cords clean and organized via clips along the arm and center pole. Articulation amp Height Adjustment 8211 The adjustable mount offers 90 to -90 tilt, 360 swivel, 360 rotation, and height adjustment along the center pole for optimal screen positioning. Monitors can be placed in portrait or landscape orientation.