The PanaVise WindowGrip Deluxe Telescoping Mount can be adjusted after installation. It is specifically designed for extra reach. Telescoping arm adjusts from 13.25" (336.6mm) to 18" (457.2mm). Arm locks firmly into position and is indexed to prevent rotation. Aircraft grade aluminum alloy shaft. Arm has 140deg. motion; knob locks arm into place. Full range of motion under the electronics 210deg. Tilt, 360deg. Turn & 360deg. Rotation. For electronics with AMPS-compatible mounting.