Modular system: Base, Shaft and Head screw together * Solid steel Shafts [0.5-Inch (12.7mm) diameter] will make a 2-Inch (50.8mm), 4-Inch (101.6mm) or 6-Inch (152.4mm) long mount. 1/4-20 stud with lockring * 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) bolt circle for solid surface mounting, and a T-Bar Clip for drop ceiling rails * Solid steel Shafts [0.5" (12.7mm) diameter] will make a 2" (50.8mm), 4" (101.6mm) or 6" (152.4mm) long mount. 1/4-20 stud with lock ring * Fully adjustable at the camera (190° Tilt, 360° Turn & 360° Rotation)