Using two bases creates better stability in a monitor array where several screens are deployed Ergotron 60-443-200 pole clamps attach a 55'-wide crossbar to two base/pole assemblies For use with Long Crossbar Extender (97-447-200), which is 55' wide Used to integrate two bases into a single monitor array to increase stability Lever mechanism allows easy placement of clamp at any point along pole Mix and match DS100 stands and parts to create custom configurations