Panavise Universal CCTV Mount Modular system: Base, Shaft and Head screw together Solid steel Shafts [0.5-Inch (12.7mm) diameter] will make a 2-Inch (50.8mm) Fully adjustable at the camera (190 degreesTilt, 360 degreesTurn & 360 degreesRotation) Knob and tamper-resistant set-screw adjusting options included. Matching vinyl cover adds a finished look! Includes 2-Inch (50.8 mm) round Base with four 0.188-Inch (4.8mm) holes on 1.6-Inch (40.6mm)