The small foot (1.625-Inch x 2-Inch) is recommended for under-the-dash installations or wherever space is at a premium. Knob and set-screw adjusting options included. Overall mount height (including shaft) is 9-Inch (228.6mm) 210 degree Tilt, 360 Turn and 360 Rotation at both ends Aluminum, zinc and steel construction Rectangular AMPS pattern: 30mm x 38mm (1.181-Inch x 1.496-Inch) on center