Panavise 727-04 4-Inch Slimline Pedestal Mount Overall mount height (including shaft) is 4-Inch (101.6mm) AMPS-compatible. Knob and set-screw adjusting option included 210 degree Tilt, 360 Turn and 360 Rotation at one end Aluminum, zinc and steel construction Concave Standard Foot evenly distributes the mounting load, accommodates slightly irregular surfaces, will not crack, and measures 2.5 x 2.5  (63.5mm x 63.5mm)