Features: 9" (228.6mm) overall mount length Includes two mounting bases that screw easily into the machined aluminum alloy shaft [0.875" (22.2mm) in diameter] Use the Tri-Foot Base [4" (101.6mm) outside diameter with three 0.265" (6.7mm) holes on a 3.25" (82.5mm) bolt circle] for solid surfaces, or the T-Bar Clip for drop ceiling rails Full range of motion at the camera: 210° Tilt, 360° Turn & 360° Rotation Knob and tamper-resistant set-screw adjusting options included 1/4-20...