Model AP4229P20B 90mm high performance adhesive mounting disk allows you to mount an Arkon or third-party 80mm windshield suction mount to your car or truck's dashboard, including mounts for Garmin and TomTom GPS devices. (Note that the disk is meant to be a bit larger than the mount to ensure a secure fit.) This package includes only the mounting disk with 3M high-performance 4229P adhesive (mounts sold separately). To apply the adhesive disk to the car's dashboard, simply remove the paper backing from the back of the plastic 3M dash mount disk, then place and press down on a previously cleaned surface. (Use included alcohol pad to ensure mounting area is clean and free of any dashboard conditioners or other treatments. For best results, allow 24 hours for the adhesive to cure before securing the base of the mount to the center of the disk.)