Details: The RPS Studio 4 Heavy Duty Hand Pump Suction Cup Mount is a heavy duty vacuum cup mount that s designed with durability and utility in mind with the ability to support more weight than most mounts will — up to 25 pounds! The built-in pump allows the vacuum cup to get a firm grip on a smooth surface. Comes complete with a protective cap, and features a 1 4 x 20 tripod thread for mounting nearly any camera.