Abstract: A tool for installing a string of insulator discs in an energized high voltage line is mounted on a hot stick. The tool comprises a pair of pivoting jaws adapted to securely grasp a string of insulators, and a hook mounted on one of the jaws for suspending the tool from the energized line. The improved tool allows a single worker to grasp an insulator disc string with the tool and suspend the disc string near an energized line. Subsequently, this worker can assist in fastening the cable clamps of the insulator string to the energized line.