Electronic Supply by Industrial Electronics in Milwaukee Wisconsin : Potter Brumfield, Radio Shack Stores in Milwaukee: Mount w/Adjustable Head, 6" Mount w/Adjustable Head, 6" ================================================================================ Staff on 05/11/2009 03:18:00 AMPS-compatible mounting plate is adjustable under the electronics. Rugged base features our famous "split ball" for 90° Tilt, 360° Turn & Rotation. * 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