SP-VHB25MM is a 70mm adhesive mounting disk that features extra-strength 3M VHB adhesive and allows you to directly mount a 25mm (1 inch) Arkon Robust Series or RAM 1” compatible mounting pedestal. This package includes only the extra-strength adhesive mounting disk (mounting pedestals sold separately). The base diameter of the mounting disk measures 70mm (2. 75 inches). To apply the adhesive disk, simply remove the red plastic from the back of the 3M VHB mounting disk, then place and press down on a previously cleaned surface. (Allow 24 hours for the adhesive to cure before securing the base of the mounting pedestal to the center of the disk for best results. ) WARNING: Use caution and discretion when adhering SPVHB25MM to your car dashboard or other surface. This disk uses 3M VHB adhesive, which is designed to be a PERMANENT solution. Use of this disk may result in permanent adherence to the selected surface. Professional strength solvents or tools may be helpful in removing the adhesive. Arkon is not responsible for any damage caused to your vehicle or other surface due to the installation of this mounting disk.