The Premier Mounts MM-AE429 3 Triple Display Arms on 42" Tube with Extrusion Base includes three, triple articulating arm mounts and a 42" pole with extrusion track base. Many monitoring consoles use aluminum extrusion or track rails to mount and position video display monitors. Use a pole extrusion base to upgrade and refurbish consoles with older displays. Each mounting head provides 90deg. of omni-directional movement. Included set screws allow the mounts to be positioned anywhere along the pole.