Brand New From ChargerCity Super Strong 65mm diameter heavy-duty magnetic base attaches to flat metal surfaces 25mm (1 inch) ball compatible with Arkon Robust Shaft Arms, and other third-party components, including Ram Mounts Size B (1" inch) 1 year direct replacement warranty ChargerCity's New 65mm diameter heavy-duty circular magnetic base Mount attaches to flat metal surfaces, including forklifts, metal cabinets and bookcases, and other warehouse locations. Connected to the base is a 25mm (1 inch) ball adapter that can be used to mount Arkon Robust Shaft Arms or other 25mm ball Ram compatible components (not included). The heavy-duty magnetic base is perfect for use on surfaces where drilling or clamping is not ideal.