Tackform™ Quick Grip AMPS Suction Cup Base Mount with Enduro Series 20mm Ball Socket Glass Filled Polymer Steel Threaded Inserts AMPS Base Compatible Land, Air, & Sea Worthy Easy & Secure Installation GLASS FILLED POLYMER - Tackform's Quick Grip suction cup with 20mm metal ball socket. The 20mm socket attaches to the suction cup base using the industry standard AMPS pattern. STEEL THREADED INSERTS - This AMPS pattern has stainless steel threaded inserts to securely mount AMPS Mounting Bases. RUGGED DESIGN - This product has been 3rd party reliability tested to ensure a secure hold to withstand vibration, temperature and humidity. Proven effective in flight, on boats, and both on-road and off-road use.LAND AIR AND SEA - This product has UV inhibitor making it suitable for outdoor use. This sea worthy suction cup can survive both freshwater and saltwater conditions. SECURE INSTALLATION - It comes equipped with a large 3.5" diameter suction pad with feathered edges for a secure seal making in installation and removal quick and easy.