The Suction Cup Base with its 4-hole AMPS compatible pattern for mounting Arkon or third-party holders or pedestals (sold separately). It’s designed to firmly grip to a range of smooth surfaces like tile, glass, fiberglass, or metal surfaces free of dust and grease. Perfect for attaching a phone or tablet holder to your car or truck windshield so you get easy access to your device during GPS navigation, for hands-free calls, or for music streaming. Additionally, you can securely grip it to a countertop to secure your holder and device if you're using it as an EPOS system.