This is the ultimate dual free standing monitor stand. This will hold up to 27" LCD monitors with room to spare. 

This arm expands to 39 inches.

Securely holds two LCD monitors above the desktop to increase workspace, improve visibility, and minimize clutter. 39" double-link swing arms optimize ergonomics and monitor views with separate tilt, rotate, side-to-side, height, and tension adjustments

SPECIFICATIONS Fits 75 x 75 mm and 100 x 100 mm VESA-compliant monitors

DIMENSIONS pole height, 18 in.; arm radius, 18 in.; Circumference pole 4.5in, arm width (extended), 39 in.; weight, 26 lbs.  Base is 13.5" W x 14.75" L

PACKAGE CONTENTS LCD Monitor Pole with Double-Link Swing Arms -- Cable management clips and trim caps -- Installation hardware with instructions, hex tool, screws to attach most standard monitors.