The AP020 90mm adhesive mounting disk allows you to mount an Arkon or third-party 80mm windshield suction mounting pedestal to your car?s dashboard, including mounting pedestals for Garmin and TomTom GPS devices. (Note that the disc is meant to be a bit larger than the mount to ensure a secure fit.) This package includes only the adhesive disk (mounting pedestals 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 disc, 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.) While this disk is meant to be a semi-permanent solution, the disk can be removed from the dash by applying a generous amount of rubbing alcohol or similar adhesive removal product to the area with a cotton swab. Let the liquid saturate the area, then work a long piece of dental floss under the disk to cut through the adhesive until the disk is removed. For an 80mm disk to use with 70mm suction mounts, see Arkon Model AP013. For a 70mm disk to use with 60mm suction mounts, see Arkon Model AP036.