SPRM080 features a heavy-duty windshield suction base with a 25mm (1 inch) ball head, which is compatible with Arkon or other third-party 25mm compatible shaft arms and mounts, including those from RAM Mounts and other third-party manufacturers. For a suction base that can be used on flat surfaces such as car dashboards, see Model SPRM079, which features Arkon's sticky suction base.