JL Safety Hook for MirorTag - Additional hook for multiple cars to use Mirortag holders for Handicapped Parking Placard - 2 included Eliminates the need to remove the hook from one rearview mirror to another when changing cars. Polarized to work on all Mirortag models. Only transfer the handicapped tag holder between cars Tough clear sturdy plastic guaranteed to resist hot and cold conditions. Will NOT bend, melt or break Install in seconds. Mirror post size: 1 inch maximum. made in USA