Amazon.com: Metal Plate for Phone Magnet, 10 Pack Volport MagicPlate with 3M Adhesive Replacement for Magnetic Phone Car Mount Holder & Cradle & Stand (Vent/CD/Windshield/Dashboard) - Rectangle and Round : Cell Phones
5mm Round Hole Aluminium Metal Plate With Holes - 8mm Pitch - 1.5mm Thick - The Mesh Company