6" (152.4mm) overall rise height. Rectangular AMPS pattern: 30mm x 38mm (1.181" x 1.496") on center. Mounting plate features 210° Tilt, 360° Turn and Rotation with knob or set-screw adjusting option (both included). 5/8" (15.9mm) shafts are easily removed and are interchangeable with any 5/8" (15.9mm) shaft. Base can be locked into place with either knob or set-screw adjusting option (both included). Knob or set-screw can be selected and installed on either side of the ball housing. Base footprint has four 0.219" (5.56mm) on a 4.23" (107.5mm) circle
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