For larger cameras and a clean installation. • 6" (152.4mm) overall length (from base to top of lockring) • Hollow aluminum shaft [1.0" (25.4mm) outside diameter; 0.875" (22.2mm) inside diameter] with hole for cable pass thru • Round pass thru hole is 0.625" (15.9mm) in diameter • 1/4-20 mounting stud with lockring • Fully adjustable at the camera: 210° Tilt, 360° Turn & 360° Rotation • Knob and tamper-resistant set-screw adjusting options included • 3" (76.2mm) round mounting base for solid surfaces with four 0.188" (4.8mm) holes on a 2.5" (63.5mm) circle