MM-BE429 Features: -Tube.-Set screws allow the mount to be positioned anywhere along the pole.-Base can be installed on 1.5" on center T-slot channel or single T-slot channel.-Each mounting head provides 90-degree of omni-directional movement.-Key hole mounting slots for faster installations. Color/Finish: -Color: Black. Dimensions: -Dimensions: 43" H x 55.85" W x 9.3" D.