Panavise 950-06 6-Inch 90 Degree Universal Radio Mount THE PREFERRED CHOICE FOR IN-VEHICLE TWO-WAY RADIOS Rugged base features our famous split ball for 90 degree Tilt, 360 Turn & Rotation Base can be locked into place with either knob or set-screw adjusting option (both included) Maximum holding power: up to 10 lbs. (4.5kg) Base footprint has four 0.219-Inch (5.56mm) holes on a 4.23 (107.5mm) circle